Malicious PDF — malware analysis report

Static analysis result for SHA-256 9480a3affb6a506e…

MALICIOUS

PDF

77.0 KB Created: 2021-06-16 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a1685546ef2b7b03d6cb1befccd62d SHA-1: 67e66d6c545abe7f1566dadc2f9fc4c3969309af SHA-256: 9480a3affb6a506e59462f0b98c93f5338846ce5326e553ce0b22e50bd75bb6b
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains references to movie titles and the wkhtmltopdf application, which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=abhimaan+jeet+full+movie+watch+online
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9b72e32bfda557d2c99d612b9a16aceb/46445689440.pdf
    • http://studiotecnicoprato.eu/userfiles/files/77853333603.pdf
    • http://pivotal-technologies.com/userfiles/file/64380635327.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608675d880ace---nisit.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cb145c15---36706363552.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/f28d67f7557d23923aeb17c901d6e48a/logesoviwelix.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2feaee4986---79837118710.pdf
    • https://alakharia.com/public_html/userfiles/file/49935211165.pdf
    • https://communeouchamps.fr/userfiles/file/31845557107.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6agoba4680cklc01f6vrgdmplp/64855208741.pdf
    • https://susta.vn/userfiles/file/51423830783.pdf
    • https://advantagelic.com/singhania/downloads/file/popevu.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84f2aada7---pavur.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7becb084---87557112219.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/15ad0dee0034cb7d9d2d305421379f83/56638412736.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc2.bin
9b9410e9a40275fed322ed0d91f09891226e5599ca4d42b99fb2730f553bbdd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 5204 bytes
font_01_sfnt_off00010170.bin
bcf38c4f7043fa2fec5cf56f7de0f5c0f141d5f26bd86f1e73934d4299bb73e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 10960 bytes

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