I also couldn´t find anything officially on Western Union´s website. Have you been able to find a company in your area yet using Jan´s link?
I did find an article that talks a bit about how Syrian refugees send money home and the flyer you were given is at least verified here:
"Western Union has noticed the growing desire among Syrian refugees to send money home, says Pia De Lima, a spokeswoman for the company, and offers commission-free transfers for 300 euros ($336) or less from Austria or Germany to Syria."
The article is recent but I would certainly check with a Western Union directly to be sure!