Amir,
The track/profile you get back after calling track/upload includes the metadata tags from the audio if no song is identified. If the audio is successfully identified, there will be an Echo Nest SOng ID in the track profile, and the artist and title will be replaced with those of the song.
25 seconds is not quite enough content to get a match; there should be at least 30 seconds. And too much distortion from recording will hamper the identification as well.
David