Why a draw? Don't they use serpentine system for pools?
Well, as I understand official document, teams will be split into groups basing on the WR: 1-3 (SRB, ITA, BRA), 4-6 (USA, TUR, DOM), 7-9 (BEL, NED, GER) etc. and after host draw (A, B, C) to each group one team from 1-3, 4-6 etc. will be drawn.