Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e1500e736ff756…

MALICIOUS

PDF

75.6 KB Created: 2021-07-01 18:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b6a0b27e9c3a4d242c89467299a5a39 SHA-1: c85df91c193715671e5497f838220488f24f1c1d SHA-256: 05e1500e736ff7568521d9d244eb2766db52878890e049b122619eb1ccf7874d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0706a65b2---22529763777.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3aab498b479c904fa104025eabe51f31/kozifemowexitijivemibu.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-13/20210513143220817474.pdf
    • https://pmsp-me.com/userfiles/files/pozivusomo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7afda8ee9a1a23e22f67cee2b85dd1ea/fasufi.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e4vhs24prmt061cb1bjaaeok7g/64584045158.pdf
    • http://luberoff.com/userfiles/file/musokopurunavubikulu.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/2e4d66786ddc885f3801dfad2f4cb520/46725723921.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3ac514918---54532449957.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160735d716248e---goduzumukesoli.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kt3ap3svnh9sq7r28fv19rmfg7/petatorukifupisupitefebug.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42c768526---lulit.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c488812769---8605725857.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820565b45cf---42905917328.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/rakurazufirerifuji.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a8c8f3b2267c67d44a2f58f1097e914f/sadopegirop.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/954lisdh696l73is4pjl5j5mpi/jefed.pdf
    • https://abofahed.com/userfiles/file/70168475051.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80489271350.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/sg62jkhrpofob1aklldbc0aqkj/95813133236.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45d40942d---18228575020.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf7f2bc3e---57758559704.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+amazon+prime+apk+for+android+tv
    • 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_off0000cb3b.bin
a43e503e79a3ef4d14b54f9421fdeb12347639c2e45035213bfd544f1d008109
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 10796 bytes
font_01_sfnt_off0000e41e.bin
ea02ea9ef7a2fa1301835d6b687b6b5c86490121a454e696a6249ad680be5405
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 14668 bytes
font_02_sfnt_off00010900.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16792 bytes