Need to know what files are included

I’m having trouble with a hacker at the moment, so I’m going thru all my files and folders trying to remove files that don’t belong. I found a break in under my /public_html/wp-content/plugins/contact-form-7 folder on one of my accounts… So, I’m working on another break in and found a file, stats.php in side the same folder on another server. I don’t see this file on any other domain that I have developed. Is this a file that contact form 7 uses? I don’t see anywhere where STATS are used in the plugin.

Thanks

Heidi Hafner

https://www.ads-software.com/extend/plugins/contact-form-7/