Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dfdfac3772d97a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 09:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb01495640d91fab393a38045a503a1f SHA-1: 14c88c15fcf507c22f7091ec569ea6bc78ddc71d SHA-256: 24dfdfac3772d97abcfb1cd7899de5969de7b3052a3f56fd0d95a6e18416369b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and unreadable. No scripts were extracted, but the presence of multiple malicious links suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nuttydog.hu/ckfinder/userfiles/files/bijarebuge.pdf In PDF document text
    • https://whereestar.com/marinarubicon/admin/file/30811932252.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/7090737998.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/be281a79ff18361d27b84196927f070d/lijiraremenatogezakapido.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/28584068820.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/70994694819.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/14633170403.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e9e97f181cd1d8c9160b081c704a6b2f/3051863938.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/puguwa.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/vitemilufedomivogikif.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/40452639618.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/88947174155.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/xuxulimevepajosikabumu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/83165356800.pdfIn PDF document text
    • http://cmtsport.com/pliki/48993883834.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/susobefejenene.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3005370ed---bodagazikeluv.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/53879736429.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/2135641499.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/10635738236.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/lawewen.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/83831023528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+korean+pubg+in+iosPDF 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_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 16936 bytes
SHA-256: a28ecc7e3dd3afde74e74b0bf01c152814e9c9c07aea9ffa241080188213d83b
font_01_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10836 bytes
SHA-256: 75238ce7652ca05390978c4809bc798d8a95311655afd6fcfb735a6f794dc7d6
font_02_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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