Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e3f9315f29cfcd…

MALICIOUS

PDF

68.1 KB Created: 2021-09-02 20:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af3502fbcda9017cec08c643d425573d SHA-1: 01824cbbd9170d329e2f8b40d38971350a2606b7 SHA-256: 31e3f9315f29cfcd5e99a830300d226b11a2267ce01664c6b503626bbc2c921c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f1efc1e---93889652990.pdf In PDF document text
    • https://rjpexport.com/files/bumib.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8d47e1967c000b1c8fa2f93a5636f565/bebosopu.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/37324926195.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3a845d8ad05fc0441589bc2bb9c1f02e/48678094260.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/32798714220.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/51034497565.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/gurokorotu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/17077340238.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/kifapuwu.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/84296193496.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0857b5304---samamujomif.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/munoxaxaradevuro.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/ravenim.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/487762a5e7691f8f6fdaad7da262f804/xijugesatibemajija.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/31031829823.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39dea91d78---zazaxakefonomolobiratuz.pdfIn PDF document text
    • http://ibb-online.ru/f/file/nijaselawov.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd4568e4e66276634ae8cd2017af1ebc/35606417278.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/56647310362.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/sifix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meal+plan+examples+pdfPDF 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_off0000af41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 14644 bytes
SHA-256: e26bbe58884e38062818259d65cc8954d9ee54d8b040e844067e9f46f0e2ce3f
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10344 bytes
SHA-256: 67f836bf8145887ff497151a41b3d05c748393a9f2072cd9ca7885784ad40170
font_02_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1