Misinformation is information that is false, or inaccurate in which was not intended to cause harm. This happens when people post things with outdated information, or from unreliable sources.
Disinformation is information that is false or inaccurate that is intended to harm, and will usually target people, groups, an organization, or an country. Disinformation usually includes things such as hoaxes, Phishing and propaganda.
Malinformation is information that is based on reality, but is intended to target, and harm a specific people, group, organization, or country. It’s pretty much saying something that’s true that’s also harmful like saying the meat industry is very bad for the environment.