Hacked site- found code in html

Hi,

All my web sites got hacked, google stopped me from entering them by a warning about malicious content. I have scanned the site and it says I have malicious content on my site. I have searched all my files and dabatases but I cannot find the script.

Now I run a test which found the dangerous script (result page). The problem is that the scanner only show me the .html-file. Also, when I look at the source on the web page, I can see the harmful script but only in the html file. I cannot find this script in the database or the .php files.

The site I am trying to get rid of the script from is https://test.undine.se/wp/

Where do I find the code the html is generated from?

Thanks
Graleh