james
If it is a model, anybody could have made it pretty quickly.
A skilled worker with either fibreglass, carbon fibre, resin,
slap it together, bog it up, sand it, prime it and paint it.
Send it to China and they would have a finished model back to you in a week,
at the same time asking how many thousands you want.
"With signs of belly landing"
Who is pulling what ?
One dark patch on the edge of a wing does not show signs of a belly landing.
it could be anything.
Re "Looking at it, one gets the impression that it doesn't have enough space to carry the fuel for a long range jet engined mission. "
Going with your theory which I think MIGHT have some merit, it doesn't need to do a long range jet engined mission, it only had to take off from Afghan and fly a couple of hundred kms to Iran, if that. (I don't know the distances from the airfields in Afghan to the Iranian border or just across it).
Just my HO.
.