Former prime minister Gulbuddin Hekmatyar is wanted by the United States and his fighters back the Taleban-led insurgency in which more than 50 US soldiers and scores of government troops have been killed this year.
"The only way to solve Afghanistan's war is for foreign forces to withdraw," the Cheragh daily quoted Hekmatyar as saying in a message the paper said was issued to mark the end of the Muslim holy month of Ramadan last week.
A senior journalist at the newspaper, Mohammad Dawood, said a copy of the message was sent to his office and it was genuine, but he did not elaborate.
Hekmatyar, a prominent commander of guerrillas who battled Soviet occupying fores in the 1980s, said his campaign would go on until US-led troops left Afghanistan.
He called on mujahideen, or holy warriors, to unite and drive out their "real enemies" as they had driven out the Soviets, the newspaper said.
He described Afghanistan's presidential election last year and September's legislative elections as "futile".
Fugitive Taleban leader Mullah Mohammad Omar issued a similar message to mark the end of the Muslim fasting month.
US-led forces ousted the Taleban in late 2001 after they refused to hand over Osama bin Laden, architect of the September 11 attacks on US cities that year. The United States leads some 20,000 foreign troops in Afghanistan, most of them American, battling insurgents and hunting their leaders.