And precisely which one is upsetting your virus checker - because this is both helpful and seriously unhelpful with a touch of scaremongering without what seems to be entirely obvious additional information that you already have.
A quick bit of investigation reveals that the company based in Slovenia uses a server in Amsterdam run by “Hosting Technology Ltd” which is owned by the same company that provided the domain registration - VDSina.ru.
RTP is for streaming media and isn’t usually related to static images. The Widgelix website based on WordPress doesn’t seem to be an issue to the usual website black lists.
There are a rash of entries in Google search for Malwarebytes RTP detection false positives, so it may simply be that, although the Russian connection may also be triggering something as well.