The
1200Z ascent data from Brindisi (nearest I can get to Corfu) suggests more or less IMC up to a few thousand feet.
Put this together with the embedded nasties in the weather data posted, this could have been another N2195B i.e. a plane probably getting out of hand in an embedded TS.
It could also be a straight CFIT resulting from a poorly planned VFR flight in IMC but - assuming the pilot actually got the weather - would one fly in IMC with this stuff around? I guess some people do.