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“сум” in Belarusian–Russian dictionaries and Belarusian dictionaries at slounik.org
Tsykhun, G. A., editor (2010), “сум”, in Этымалагічны слоўнік беларускай мовы [Etymological Dictionary of the Belarusian Language] (in Belarusian), volumes 13 (су- – трапка́ч), Minsk: Belaruskaia navuka, →ISBN, page 38
The dependent form is specific to this verb only and is basically a second present form that is used in compound forms, such as the future, the да-construction, etc. It is analogous to the dependent present form of perfective verbs and its presence in the conjugation of "сум" is due to suppletion.
Melnychuk, O. S., editor (2006), “сум”, in Етимологічний словник української мови [Etymological Dictionary of the Ukrainian Language] (in Ukrainian), volumes 5 (Р – Т), Kyiv: Naukova Dumka, →ISBN, page 473