I have a problem with my wordpress-based site which went wrong without any obvious reason. instead of normal view of the page it shows its php code and it's content in some kind of default style.
It look like this:
[link moderated - hacked site contains malware]
I've tried to change site's theme to classic, but it didn't solve the issue.
Update is also not helping.
I have one total backup from november 30, but I'm not sure if site was working fine back then, and restoring from it doesn't helping either.