Emmanuel Macron, the more liberal candidate for president of France, has been victim of a hacking attack, his campaign said on Friday.

His campaign claims that the hackers who stole the documents want to damage Macron's chances less than two days before the second round of the election, according to a report from Reuters.

"The En Marche! Movement has been the victim of a massive and co-ordinated hack this evening which has given rise to the diffusion on social media of various internal information," the campaign said in a statement.

Reuters reports that nine gigabytes of data were posted by a user going by the name "EMLEAKS," to Pastebin, a document-sharing website. The identity of the leaker was not immediately known.

Macron is heavily favored to win the run-off election Sunday against Marine Le Pen of the National Front, following the first round of voting in April.

Macron's campaign says leak authors wanted to undermine campaign before second-round vote, but documents have no reason to concern them, according to Reuters.

WikiLeaks, a secrets-revealing website well known for publishing documents from the Democratic officials during the 2016 U.S. presidential election, said the many tens of thousands of emails, photos, attachments up to April 24 probably isn't a complete fake, but even so won't likely sway the election.

"A significant leak. It is not economically feasible to fabricate the whole. We are now checking parts," the group tweeted.

"This massive leak is too late to shift the election," the group said, adding that the "intent behind the timing is curious."