Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e62b8a1ff916414…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 07:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38cf0f68b51ee65279b27bb46d86e1e5 SHA-1: 685e2603cfe2fef0ae65a0f594e8867adfcea0e4 SHA-256: 5e62b8a1ff9164148228b9867aac88312944708b6c9b3e71f47bc2fbda69cbae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://glttek.com/userfiles/file/vofokumufitepowute.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fddf5a8470---taketiner.pdf
    • http://cesiedizioni.com/userfiles/file/56385901127.pdf
    • http://historia-bfured.hu/userfiles/file/68296622476.pdf
    • http://amuseonline.com/absite/userfiles/file/40944365055.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e2fccd227ddba37a42dba85a5ab5505/voboje.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609282ff8df27---lopovoberubikepep.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/95006952269.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133ebad637---zijubezibaveraroxalewa.pdf
    • http://flyingkirin.com/uploadfiles/file/200022511301.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/47n0b769er82uqndp39liv5oqa/6946592481.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b74368788---99431460754.pdf
    • http://milliondollardesiclub.com/upload_files/featured/files/pugivusowetafabijom.pdf
    • http://ekotop.eu/userfiles/file/35173025292.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bf7a62969ab91d687488f0a18932619e/14488265466.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/96021425070.pdf
    • https://csodamalom.hu/files/files/sagibugabupolawusidu.pdf
    • https://uleshuzataruhaz.hu/files/file/7308793788.pdf
    • https://joinvita.com/neu/userfiles/file/9119347829.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/88369549441.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/76665694108.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/acjbccpi7ebm6812kp2loal4d7/57937573589.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=serbian+vocabulary+for+english+speakers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74d.bin
88bcb773141e67f361e4c3933a1fda6cb84ccbd2d5bdd7ce17beafd798047c52
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 20024 bytes
font_01_sfnt_off0000fb80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
font_02_sfnt_off00011397.bin
2e25a9b1bba16d872fdcd6213d35577d3bc8d73b54ac600e84b49140c3c1efe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 11388 bytes