One of the fliers calls for “Death to old lunatic Trump!” and is illustrated with a North Korean soldier with rifle in hand, crushing with his foot what looks to be Mr Trump’s head with the president’s tongue hanging out.
It carries the strapline “complete obliteration”. This is believed to be a reference to some of the phrases used by the US president in his anti-Kim rhetoric.
Another leaflet shows Mr Trump with the body of a dog being decapitated by an axe.
Blood is shown splattered on the axe in the poster, which states: “Let’s behead mad dog Trump for the future of a peaceful and warless world and mankind!”
North Korean propaganda posters after find their way into South Korea and are usually flown by balloon over the highly fortified demilitarised zone.
Military images and anti-US threats are common in North Korea propaganda as Pyongyang demands the US cease what it says is its preparations for invasion.
But the new series of fliers posted recently on Twitter and other social media specifically target Mr Trump.
In an apparent dig at Mr Trump’s for an inflammatory speech he made to the UN General Assembly, one of the propaganda sheets portrays the president standing behind a podium with a rocket in his mouth painted with the words “totally destroy North Korea”.
Again, he is depicted as a dog with a human face and labelled as “mad dog Trump”.
Men in suits with surprised looks on their faces are shown in the poster saying: “He’s gone completely insane.”
It adds: “If we let him be, there will be war”.
Chad O’Carroll, managing director of Seoul-based news subscription service NK News, found the leaflets while jogging in the South Korean capital.
He said: “I am pretty sure it came from North Korea by balloon, since the prevailing winds during October have been from north to south and we’ve been getting reports of others finding them throughout Seoul.”
North Korea has carried out a series of nuclear and missile tests in defiance of UN sanctions this year sparking an angry war of words with Washington and fears over nuclear conflict in neighbouring South Korea and nearby Japan.