Malicious PDF — malware analysis report

Static analysis result for SHA-256 237b3c97fcaac79b…

MALICIOUS

PDF

129.1 KB Created: 2021-07-08 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb10eb58e62a9ede541ebf76ef9daa18 SHA-1: 8a51191f31836ad1a7ec49af16cb2a280eeb0a2c SHA-256: 237b3c97fcaac79b98ab7f2abaf60679cf8eed794e235538ee9b12bcfb7910f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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 https://queure.ru/uplcv?utm_term=rambo+to+hell+and+back
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/937a461fdbf67f10e6bc6877b437ea30/luvanur.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077739cb3aae---69847929210.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/6lhkl05aqj2154no925588ts65/romid.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/91287920381.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489d619af0---55481593653.pdf
    • http://voijin.com/userfiles/files/83969776513.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/10984278823.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44115e0145---bubus.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a68163eb7d4ddd173a62e216560cba13/54322922519.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/figuwabuwuwibaban.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e6c0ce00---76997635630.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102a60fb02---sidarobabopafibabezutamop.pdf
    • https://sentinels.ro/userfiles/file/61010369032.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda00a5971---gofofen.pdf
    • http://yachtandgulet.com/userfiles/file/87678688324.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e6a31c47b74415ba2f4997f9ec69d66/10684759387.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d1ed7c4c---67547975323.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2700638d8---57972352204.pdf
    • http://wildpflanzen-planung.de/file/65065602378.pdf
    • http://palaciodelosnavas.com/userfiles/file/14118414189.pdf
    • http://filtrydokoparek.pl/img/all/gokexam.pdf
    • http://aweibel.com/Photo/file/vipam.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnvgktiqf5takhqgjr6n8et8ug/popoxotatitiwuzajivev.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701d298e0f4---65020485372.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j5so74k0kfg5t1f0qn780bpfs2/1550086208.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016bbb.bin
94db6cea7b5a600964499e0f31d2f344791412ac50ed02ac80bf5b4000c4d4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBB 17276 bytes
font_01_sfnt_off0001855c.bin
8cbca7e80e5c6c2ed8b9e3f3c279c867a8a83f8467e4dd950568d717b9019f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1855C 4976 bytes
font_02_sfnt_off000197e4.bin
b33ce410ef7129be0752192537c25bf0a461223ab7f971dadfdb16403832aadf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x197E4 10552 bytes
font_03_sfnt_off0001afc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFC9 16792 bytes
font_04_sfnt_off0001c7db.bin
2c6e976f9f4b667c0f36d6bb983f295d643f2b7a99d6432812948eee482f5e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7DB 17648 bytes

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