After some further investigation (with input from the comment above), here are my preliminary results.
Muslim Scholars Database
People currently working on computational hadith analysis:
Irene Kirchner, PhD student at Georgetown University
Mairaj Syed, professor at UC Davis
Others not listed that are included from the papers below
This hadith has been compiled in different hadith compilations and versions one of them appears in abu Dawod's Sunan:
‘Abd Allaah bin Jafar said “The Apostle of Allaah(ﷺ) seated me behind him(on his ride) one day, and told me secretly a thing asking me not to tell it to anyone. The place for easing dearer to the Apostle of Allaah(ﷺ) was a mound or host of ...
To supplement goldPseudo's answer: Both eating and drinking while standing has generally been considered permissible, although makruh tanzihi or khilaf al-awla by some. That is because while some reports are against it however a group of the Sahaba have narrated its legality, for example:
عن ابن عمر قال: كنا على عهد رسول الله صلى الله عليه وسلم نأكل ونحن ...
The ruling on drinking while standing is based on a number of hadiths wherein the prophet is said to have prohibited the action, but these prohibitions explicitly mention drinking and are silent on the topic of eating. Given that eating (while standing or not) is not considered an act of worship, the general principle in Islamic jurisprudence is that it is ...