Malicious PDF — malware analysis report

Static analysis result for SHA-256 947d5df4a8b5577d…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 12:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b4e4e38695a360230147a88f2420fca SHA-1: 31eb4f919c1f97f6e41f686de15a9144844ad6ea SHA-256: 947d5df4a8b5577d646bd0906e017754b98bf5c30631d266d07024f5cfbadad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed22b1772---jixeper.pdf
    • http://volkshilfe-vlbg.at/images/content/files/noxusifusenu.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a92fe086b---ziralajiraboni.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb430f0c---94438235928.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160908b1c786e2---muxurupezalidomis.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/35d55189638c991ab8cc614107b263e6/biwurilukatodili.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e0ada1d547a8835ce420d492092c9ff5/nenaxijawajuneb.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/83e39e40a0059cf2f3136d0cb4ed369c/vakotegegedetogug.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/86c98aa15178209de6a0ee6724624f52/23821763489.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/8849kak2bfsq125iiklajbg4p3/vazub.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b10f68a316c---51586522268.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8df2ae823dc1f893fe7fdc1d09cf5dc4/mazidobisoneperepexubos.pdf
    • https://bbpartner.cz/userfiles/file/gukuzowolujikapovi.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806270147cc---denukarijixigubo.pdf
    • https://kar360.com/resimler/files/kotowirukas.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160762ce5ed406---16937710841.pdf
    • https://bursakaynak.com/userfiles/file/47412614326.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/032fbf77996e97bec716aa5eebcd63b0/dimosubegufun.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/28143315555.pdf
    • https://mosconi.net/userfiles/file/jinodinivorixa.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9f1975e6a---99602304252.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=java+typecast+string+to+int
    • 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_off0000df91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 16792 bytes
font_01_sfnt_off0000f7a3.bin
3a3deb6c10c3238d8374e7bb7f05f519163029a45270d7a0f036ebca9f3fad8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 18032 bytes
font_02_sfnt_off0001275a.bin
7c6052d4b68c437878d6ce0b2c1a1dc2c081dd9b0f4df3b1edc39f9bfaee2bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 10676 bytes