Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5aeeccdc85bf6b…

MALICIOUS

PDF

88.7 KB Created: 2021-06-11 12:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe10459729bae9ee7fe17a132eda93a SHA-1: d7020237904dcc8ef50f22e97822009a01547aaf SHA-256: 2f5aeeccdc85bf6b91f7dfe59d94d7d7fa85ec8d4e298f45f5d5040f2e146d16
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=congruence+worksheet+with+answers+pdf
    • http://alt-1c.ru/userfiles/file/64720416651.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fe6f2fba2---31745880649.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b99dd6db5---vujaxesexugavudigegeroz.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/26341d28e2fb795dbeb35b3d0217cb12/81787108274.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/46i1r09ogtie11sos8gral55h5/9361145010.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794222263a2---79295748615.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b93fcfc1b6a---tigosa.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7u9vp6bffhgdk60nl9gja2ka55/dabejin.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/0g6367jopqisbhfk6mmj4q8sam/begubagegasariwavoz.pdf
    • http://wsp.pl/userfiles/file/48646321067.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qte2p9j8ccf68hagtd4vbcf11k/18915950073.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/61aae6183fb4343b4a5416361cfede03/rekelatube.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af4a99663---nujosubobidorewimuxole.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dee2ed220---nixijuku.pdf
    • http://banghaija.com/userfiles/file/44327417703.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0001061e.bin
1dce46da2741814143c2005181e8bb3840412ce768a86f9161bf545ff5f825d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 5448 bytes
font_01_sfnt_off000118bc.bin
6cc31189a6b2421f96a30b7cf17600ceef6243689a01cd6cc3e2ffcd4b206838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 12292 bytes
font_02_sfnt_off000140e9.bin
6f31d8a09968cb758392806dff4ce0e2643fc3d6dc332c5b9fa07753cf63feee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 16076 bytes

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