Malicious PDF — malware analysis report

Static analysis result for SHA-256 75281905dfd4531b…

MALICIOUS

PDF

76.2 KB Created: 2021-06-26 21:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7f4933d41b17dce8337d8c121aea873 SHA-1: 3b5894e2f6a6c8bd78e8b05f2b944850e91f1ac0 SHA-256: 75281905dfd4531b1ecf8c4a272833c1435ada641cf5d1d6a55d0571571064c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=maize+meal+50kg+price', are likely used to distribute further malicious content or phish for credentials.

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://huntic.ru/uplcv?utm_term=maize+meal+50kg+price
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f1d5647f77788f337bc0fd715e91e54e/beririxelusozux.pdf
    • http://tamker.hu/userfiles/file/xinoxigezuli.pdf
    • http://botosani.ro/img/uploads/file/xenisuvodaxoguwagases.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091113be9182---nujofexuzetugavuxiriw.pdf
    • http://altelaw.com/uploads/image/file/bimawofa.pdf
    • http://adance0112.com/upfile/editor/file/denok.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf715662d4---89293588974.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b95b15552---biralenufasobedutovolulor.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8eb11586---vawewowamuzalumelipa.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c626232bb00---tenipafatapifinivowuw.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/923635f77c470ffe211c54cac0649f24/worunoz.pdf
    • http://alexhofford.com/temp/files/file/dusekuxelevo.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3153e4c4c---zixaguzawozowaj.pdf
    • http://artecgroupservices.com/imagenes/file/83091771823.pdf
    • https://esperanzadeavila.com/fotos/file/21132969775.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_off0000c89a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 16792 bytes
font_01_sfnt_off0000e0ac.bin
4243887196fb28fe5eaa96cdd40efb3d63abcd97f1db400671bc452e6c96713d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 16480 bytes
font_02_sfnt_off00010be2.bin
ac8b3e0a682790a41e850e6116076a0464b107e593fb7209766268d5bb5a6dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 10628 bytes

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