Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c131c2ab399095b…

MALICIOUS

PDF

96.0 KB Created: 2021-07-02 02:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd28ac52fcf5cc03631bbe5d43ec4836 SHA-1: 3ee96ece25615f225a24c7771e2e1a6fcdd7becc SHA-256: 2c131c2ab399095bc398fe61a8797c99874f27bd3ed724dd0b3ade4c6b2a42cb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to lure victims through phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://crysiq.ru/uplcv?utm_term=nucleoplasm+in+animal+cell PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/sumomenuset.pdfIn PDF document text
    • http://altinay-law.com/images/file/53154779010.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3sj15131qj3rt7iu5ehftq481f/76074797195.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/20436127568.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/susiwozumijolidusiz.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9b9a356b---wujunolewe.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/gorapomij.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf36262f5---piloxubivuzobadozi.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/66623060797.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/48197618642.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/bilap.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/25427469240.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/fb062d5ecc14c4d4d58b3cd841a82a75/8690064587.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e418d4cab1---11302731823.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/kumovuzomubarega.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d397749d---87022893742.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/segaf.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/60a59ed54de22ccac2c7ba5a991b00f3/62193132846.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/42fe6fe2ac4f76377e509743a40c5735/61862517988.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/pbgkquiu4emmbkftjbak1iq2bs/62283569747.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bb36a87c0438a8e19638d6392c093638/92130066409.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7950b2a2c7c09b0d37e8a12c73c80851/merejuw.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160af7b7460b47---61945013956.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/22445949c955603d025f7bc6ce7fcc0a/vibizibivoropor.pdfIn PDF document text
    • 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_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 10416 bytes
SHA-256: 373fc1cd05443edca01200bf417d05cb29159f50bd0f3a5bb019c3facbe095fe
font_01_sfnt_off00012c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 17740 bytes
SHA-256: 9e356325e4f8c03755343126883bbd7abb22625df516dc0d410fa87d4ca1f24e
font_02_sfnt_off00015a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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