malware scan not showing problems but site is hack

Some years ago my site had got the pharma hack. I had got the site cleaned up and it looked like it was working fine to me.
The issue is that I have moved my site from 2.5 to 3.5 recently. I transfered the joomla core database and exentsion database using SP transfer to Joomla 3.5 install on a WAMP server. I even changed my host. Everything is working fine except the there were all these pharma content in some old articles and in the redirect section.
I have manually removed the pharma content for the articles and it has stayed like that but in the redirect section even though I deleted all the the fake redirects mentioning benoquin, famvir etc. it still keeps coming back. which means that something else is there in core files that keeps injecting this stuff in the sql. I ran the malware scanner in security check pro and it finds nothing even though it is clear that something is there.

Thank you that worked. It located some files that showed that they were high risk. Should i also do scan with OPSWAT so it can narrow down the files. I am not sure what the next step should be in this case? How do I remove / fix these files now that they are there?

Hi Jose,
I bought and installed your software yesterday. It didn't show any malware, but fortunately some other software I installed did, and I got the site cleaned before it was taken offline. Are these new files included with what I downloaded yesterday? I had an API key from OPSWAT, but that is now gone, and their system says it's generating the API now.

I have recreated 2 sites from scratch, and uploaded all core Joomla files to all 3 of my domains to overwite any modified files. I've reinstalled all components, modules, and plugins to also overwrite any modified files there, but something is trying to send email from one of the domains, and the host can't see the problem as it's coming from one of the sites. I've changed all email passwords, and all login passwords, plus have 2 factor authentication active.

Do you have any idea how I can find this email issue?

Thanks,
Louis

Webmaster wrote: Hi Cyriac,

By feault, the malware scanner only looks for malware in files modified a week ago. To scan the entire filesystem looking also for suspicious patterns, go to Global configuration --> Malware scanner and set the "deep scan" to Yes and the "timeline" to 10000.
Also I'm going to send you a modified version of the extensions with some improvements in the malware scanner. I will use the email you used to register in my site.

Regards,
Jose