Final answer:
The attacker was performing brute-force cracking to find the wireless printer's WPS PIN.
Step-by-step explanation:
The type of password cracking that the attacker was performing is brute-force. Brute-force cracking involves systematically trying every possible combination until the correct one is found. In this case, the attacker started with 00000000 and continued to increment by 1 each time until they found the correct PIN, 13252342.