Malicious PDF — malware analysis report

Static analysis result for SHA-256 812b79a02252aafe…

MALICIOUS

PDF

116.2 KB Created: 2021-07-31 00:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b760f8fe63d762a651c6e176692b94b SHA-1: 64e996c3f7d99ebb0a08d834308d13de82ca6bef SHA-256: 812b79a02252aafe1e22c9011c4ddcd91b0a7074cd5c4d601aa513d09f1239ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://doo-san.com/userfiles/file/20210522114103.pdf
    • http://juentai.com/userfiles/files/zevudurupatataruzabapefef.pdf
    • http://hoanhaochemical.com/uploads/files/79315178607.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f715acb26376eff392458fee519e32fd/soxipabudezulunasexewonog.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bd8ec6ac---nelezopiv.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gsfmi6acfvc7hi3hrp01d5jd8a/najora.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4744c55a1f3ec5a3a3cfa08edba10c57/xarerawibanirutakusatux.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609613b77d4d3---57031532300.pdf
    • https://ludifrance.fr/userfiles/file/23694887878.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/otckbcu9emd7f8kh4fmvjoi3gt/jovediwev.pdf
    • https://iveducentar.com/uploads/assets/file/73055484704.pdf
    • https://alixdemassy.fr/userfiles/file/20761777713.pdf
    • http://dichvuwebsites.com/media/ftp/file/suzexupezeguvadarotuvas.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be1828e5084---xexumopagodapinesoguri.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/i0fj2nt6j0mfjjq9687jdfeoc5/48803942621.pdf
    • http://bogelaipigeon.com/upload/file/xololemobuzewilapesajuf.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7e3b99c043b384b8539199495b7529f2/mifufevifobi.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/o00tbf5hjop8l6cojvftpo2hj7/44527831803.pdf
    • http://rotarybrescello.it/userfiles/files/59463256655.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/67cc5c28aa0f36c5d846118c001415b7/siwezifazoxosojujewusi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=craftsman+staple+gun+68514+owners+manual
    • https://lapdonline.org/file/80950490371.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_off00015e44.bin
f11381bf4f04fdeee20984140c0fc97d0368c07bacaaf48fb6a52f234a2fa8c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E44 18876 bytes
font_01_sfnt_off00019016.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19016 16792 bytes
font_02_sfnt_off0001a82d.bin
b477e7429727959a6bd042028db078755e071197a81c1964e10f53ecefa8cf36
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A82D 11468 bytes