Malicious PDF — malware analysis report

Static analysis result for SHA-256 03717df5618f3c38…

MALICIOUS

PDF

97.7 KB Created: 2021-07-30 15:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 958af5d6b4385c54c629f8e1f59d7332 SHA-1: e7c4c99e229ac3c5301d3ccd98d27381eae0cbed SHA-256: 03717df5618f3c3886b9ae076de2bb7f354f2221ea3772ecfdab6269eb368d40
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://detectiveoffice.net/userfiles/file/tezetumebejas.pdf In PDF document text
    • http://andlupa.com/userfiles/file/voxazefalugilukex.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/roxurivimexamefevox.pdfIn PDF document text
    • http://funperm.ru/content/file/79981929046.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/36810500844.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/124426723eea42c8893c421800a1f7fd/zilezelesulumituvosexovor.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4962bb70b4---68886494957.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/xusikobavifiteremekobida.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/viretob.pdfIn PDF document text
    • http://balone.net/_upload/file///84793827366.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/74447005897.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/noderumax.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/bemobafagituri.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/595e42447bfe3141a379625ba0c8fd38/41999394051.pdfIn PDF document text
    • http://patroha.hu/file/joxawajosifutut.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/b1e9184650adbf4b30860d44c1e7ab59/18727024245.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/93954624740.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zananizugigefumisag.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/biwugolurusivivusepe.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/gevuwajerokav.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609655238bce5---semikibigapasev.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/jegowuzunesavosunupomodet.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f5cecbeeb---kagaxuzowexigelur.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/43028278789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=why+did+augusto+boal+create+theatre+of+the+oppressedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 11144 bytes
SHA-256: 44472d0ca72d42c6107555ffc04e21afa3898cd6aa74404821adf49996dbe2b5
font_02_sfnt_off00014a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9F 17608 bytes
SHA-256: dfd4ab26f3b298618d4ffd358a117052eb2b8073e9b0810604ecb549cb5bc103