My site redirect to porno site ( wordfence nothing found )

I’ve been searching the last couple weeks and tried to solve a problem with my site but with no success. The problem is that sometimes I get redirected to a porno site (not always the same) when I try to access mine. I’m using WordPress and I’ve searched for malicious code snippets in the index.php, header.php and all theme related files and found nothing that could be doing this. The wordfence premium plugin- with full scan- unfortunately nothing found!!! I changing my DNS, to amazon… and i take the same problem! I delete and rebuild .htacces…. the same problem! I change all my password… the same problem! i contact to my hosting… nothing found!!!

This is a very hard problem to solve cause it’s nearly impossible to reproduce, it just happens sometimes. For example, if you try to access one article from my site and you get redirected that doesn’t mean you will always get redirected when accessing that article again (even from another computer), making it very hard to debug.

Do you have an idea how to fix this? Is there any way I can disable redirects to another domain or something?

Before I got redirected to the final site, I was able to see this source (i put some stars in the link for security reasons): http://tza9ztva*********c6fty3cutze9crf.babespornfree.com/adsort.php?xx=1&aid=2&atr=dirs&src=236

I’m not sure if this is useful since it gives no almost information. Beaware that link (with no stars) can redirect you to porno site.

https://wordpress.org/plugins/wordfence/