Themes Index.php getting hacked

https://smackdown.blogsblogsblogs.com/2008/06/24/how-to-completely-clean-your-hacked-wordpress-installation/
https://ottopress.com/2009/hacked-wordpress-backdoors/
https://codex.www.ads-software.com/Hardening_WordPress

I’ve read these over, but I have to be honest. I am afraid I am going to wipe something out on my site. I tried the update, but that hasn’t worked. In fact, I now see that they also hacked my other pages as well.

Basic html was always easy for me, but this is beyond my abilities. Is there anyone that could offer to help make my site safe?

Just found the other pages are hacked as well…the first time this happened, I just replaced the index.php in the themes and the problem went away. Now all the other pages have been changed.

https://www.ai2-3d.com

I have an old copy where I can replace files, but I am not sure where to look. Suggestions?

Some more links for you:

https://codex.www.ads-software.com/FAQ_My_site_was_hacked
https://www.ads-software.com/support/topic/268083#post-1065779

I strongly suggest that you follow the advice in these links & the ones I posted above. If you feel that this is beyond your capabilities, you might want to consider engaging a professional to assist you.