Malicious PDF — malware analysis report

Static analysis result for SHA-256 df409fb90b8be94b…

MALICIOUS

PDF

83.2 KB Created: 2021-06-17 00:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1e941853512a265946b06204817a168f SHA-1: c943d709b4a4a092250478a48f5824ee50cf77cf SHA-256: df409fb90b8be94b2d08d24e62579dc5423611f90c5d648c642b1ec0a9f3a764
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection scheme to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9547

Heuristics 5

  • 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
  • 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=love+status+punjabi+download PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9e6ff22---wejudaruzeniwotenikezato.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2e8481ed6b03c900bb0f9ba74b876700/zubuwitaregudavibotisije.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5fcbefe9ac957850249fc3ddf4e074f8/86541610503.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d236d60e---89389559231.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/tisolofexudapevu.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/pemujobixisibuduzubonolad.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c359ebef---pupaluxokavebid.pdfIn PDF document text
    • http://ahchala.com/img/file/63564911446.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/menuruxilepeku.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c6703f29---47411211426.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e270d149f8b204375b2ef080681c5194/18051795563.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b4a5de90641ff497a682f3dcb7dd7340/mavobagux.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/zoganoruvonotafam.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759bfdda2c6---milixowidipivun.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/98629995730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 5164 bytes
SHA-256: 760f77447563da393083d7c2cff72404b3f48bb5b690f979b40240899450b7ee

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