According to recent studies, the human malaria parasite Plasmodium falciparum was introduced to humans from:

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Recent genetic sequencing studies have suggested that P. falciparum may have originated from gorillas, likely through cross-species transmission via a single event of transmission to humans. There is no evidence to suggest that pocket gophers or orangutans played a role in the transmission of malaria to humans. While there is evidence that other Plasmodium species have been transmitted from chimpanzees and other primates to humans, P. falciparum is not believed to have been introduced to humans from chimpanzees.

According to Recent Studies, the Human Malaria Parasite Plasmodium Falciparum