This is the Android integration daemon that listens on all interfaces by default in Debian Stretch. We should keep an eye on it for Whonix 14 and disable or remove it.
Can you please look into it when you get a chance to check out https://forums.whonix.org/t/whonix-13-0-0-1-4-developers-only? Or create a ticket?
Btw 188.8.131.52.4 requires some basic testing for KVM compatibility anyhow. Should work in theory, but any changes due to jessie -> stretch might have broken something.
Package https://packages.debian.org/stretch/kdeconnect contains:
I had one non-Whonix KDE system where it was running. One can see it using:
sudo netstat -tulpen
The kdeconnect guys never got back to me. I guess they weren't too excited about a first post asking how to shutdown their stuff