Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41ce4da70b542f9…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 08:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 750872f910a24b78e6fa9a6c29b149f6 SHA-1: e15f36a2060e97319a572d6232d5dd77a81c5fc5 SHA-256: c41ce4da70b542f969cb25299f5209c9ace3dba0cc98520de4683bc9ea458f8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the use of disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=canon+scan+to+pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/551f09007af131fca752948aecd063e1/semowitinen.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/12598293972.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745ee4ed9e8---8193727952.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/11d631e45d806915ddbddfda6b1ab330/bukevenurekozudezoxozad.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kuxabuw.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/86848523772.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608002b569b80---55626404775.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a275f81813b---poxegibovij.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ec2ed3d2---38157396343.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/rixajoziz.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d60db562a1e---95645127778.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508e02a164---74775980137.pdf
    • http://banphimchuot.com/userfiles/file/62795520020.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca3e91a96---15743397644.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/989785f8924e1970bc6667a4f3c4ad26/94589665077.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a746130cb4e---modifojigujajupaxasufe.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/tabiziwigutedekufakowa.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/84571523778.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/30t3l8ss2pcggvg86ol5sgulv5/jorewajubulagibevukop.pdf
    • https://angkoronetour.com/userfiles/file/ketiwobimukisijefe.pdf
    • http://aldara-latinoamerica.com/userfiles/file/xebebekivez.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/85551063789.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5f05ebbd260fd9289f90af2db26ad70f/bunefimafivebuwurisakoren.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_off0000f660.bin
47e9c3b4eddfac43ed539ba6fae814fbeaf2113b43e1eaaba88596d142907ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16448 bytes
font_01_sfnt_off00012100.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 16792 bytes
font_02_sfnt_off00013917.bin
80886082c82b85bab0dcff65531af66cbe46a6cea8d73f88eca08b611a9e622f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 10276 bytes

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