I would bet UltraAV is some kind of Russian/Chinese spyware.
I give admin-level access to this stuff (or Windows/Play has it already) and it has an all-access pass to all activity, including reading my screen and every web page.
So the only difference between that and "spyware" is semantics, connotation, and trust.
That being said, I used to run ClamAV, and as I understood it, it was far from a complete security suite, only a scanner, and had no reason to communicate with anything.
Also, it never gave me anything but false positives, flagging image files (jpg, png) on my Linux system with obsolete/benign win32 malware. I wasn't running win32. Idiots.