Pecker is a key witness in the case against the former US president, who is accused of falsifying business records to cover up hush-money payment
The outlawed Tehreek-e-Taliban Pakistan (TTP) attacked the NATO containers in Attock district, some 95 km northwest of the capital city in 2010.
The court also imposed a penalty of 300,000 rupees on each convict.
The lawyer for the convicts said he would challenge the verdict in the high court.
A group of armed Taliban attacked the NATO tankers when their drivers were having dinner at a roadside hotel.
The militants fired at the police as they arrived at the scene.
The attackers had been arrested from the tribal region. Investigators said the TTP men had confessed to their crime.
Pecker is a key witness in the case against the former US president, who is accused of falsifying business records to cover up hush-money payment
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