Malicious PDF — malware analysis report

Static analysis result for SHA-256 44182ced8b66d872…

MALICIOUS

PDF

79.2 KB Created: 2021-06-25 12:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f981e05fcb0a9310665c85fbd0ac7855 SHA-1: 7c6fd9be684a3d3d38d9bf1a525fe9c566675efd SHA-256: 44182ced8b66d8724e309b260619b3b62f4216a5ad2945f07e654e36fc931c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=sunky+the+game+online
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ni56icmac7heduejk5qa7j87pl/48713391207.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827c7f45e9f---zavisipinefijudikomokavoz.pdf
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/26887927583.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1ff74976---wenokibetemorebu.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204e0c71b6---texajafonokaxepugubewig.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b440353451---31455023757.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77f18adf0---83692825828.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ua8d6se2mvac22a2c1441ii777/noneki.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbb8c8ed9---kubox.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/95ed4ae0f259f4489c0253a4fa8b0b62/silipigalaloxuriwakovulik.pdf
    • https://gizaviation.com/uploads/files/45782448795.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kejoredomuvifu.pdf
    • https://people11people.gr/uploads/File/bisorapogasa.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/98e6de5b0d3945dcc7063fa65b3ec0a0/79956554311.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608753cfb7f06---80619974291.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_off0000d51c.bin
9918f2d6051e27d7783623cded0cb65c27dac405199f698be1aa300430c0d3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 10668 bytes
font_01_sfnt_off0000ed6c.bin
e52006fcf823178f65b667b4183fbd22e609d25935451a4244dd2dd712f2a599		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16536 bytes
font_02_sfnt_off0001184b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16792 bytes

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