Voodoo spider

[Strip]

In the early morning of September 18, I found this fella sitting on my car. It's about 25-30mm with the legs, very flat maybe less than 4 mm and a strange face on the back. I didn't notice the "face" at the time, I took the photo because it looked so very thin.
Me, my car and the spider was located in Sweden.
Maybe someone knows more about this creature?

[NRF]

It's a Philidromus sp., perhaps P. margaritatus (en snabblöparspindel). The face on its back sometimes looks like a skull.