Samsung S7 hacked and running some FTP server? I believe my Samsung S7 was hacked. It looks like an external server with Linux is running via my router's FTP server (Fritz!Box):

  
Screenshots (click images to enlarge)

The second screenshot is from the system protocol, the third from a detection app I had downloaded.

Please help!
(Note: at the time this answer was written, only the first screenshot was present in the question post.)

Your screenshot shows details of some app you've selected. More specifically: it shows the permissions that app requested, as seen in the background. Obviously you've tapped one permission, so an explanation for that permission is shown. That permission is DUMP.

This permission is normally used during development, to retrieve detailed debugging information to narrow down errors – which is why it has the protection level "development" assigned. For such a permission to become effective, the ROM must be signed with a development key – a case a normal user with a "normal device" shouldn't encounter.

To answer your direct question: No, this is not a sign of being "hacked". Just a sign a (careless) developer forgot to clean up :)