World champions Australia stayed on top of the round-robin league standings with nine points from three successive victories.
Defending champions New Zealand, who today defeated Japan 4-1, are in the second spot with eight points from four outings.
Pakistan put up a stiff resistance despite Australia taking the initial lead through a 24th minute penalty corner conversion by Blake Govers before two goals in successive minutes featuring Dwyer took the fight out of them.
A minute later, Dwyer applied the finishing touch to a long through ball from Chris Ciriello as the deflection gave the custodian no chance.
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Aran Zalewski rounded off the Australian scoring in the 52nd minute as he hustled past one defender on top of the circle and beat another with his low shot into the boards.
Pakistan, whose next fixture is against arch-rivals India on Tuesday, now have three points from three outings.
New Zealand faced no trouble in overcoming the young Japanese team, which features nine youngsters appearing in their first senior tournament.
Nick Wilson opened the account in the fourth minute in open play and captain Simon Child extended the lead with another field goal in the 13th minute.
Japan shot back through a flash strike from Kazuma Murata in the 20th minute.
The young Japanese team played a close-marking game to deny the Black Sticks until Nic Woods converted a penalty corner in the 27th minute.
New Zealand have now won two and drawn two of their matches. For Japan this was their fourth successive loss.