Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ee3949f09192c7…

MALICIOUS

PDF

73.7 KB Created: 2021-06-11 00:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a39ea2d90df0f3837c862b445d86ab69 SHA-1: d2f5c383661b0c6dac9092b7d86b5dcf16642ea5 SHA-256: b0ee3949f09192c78ad06bf02f39ec07ba20124857619dcb90c4a4e95dc05046
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing campaign, potentially using embedded JavaScript to facilitate the redirection.

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://wastran.ru/uplcv?utm_term=jax+mortal+kombat+x+fatality PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/afa4c8c44b7f21eec575a6ebd226a239/rejebub.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bhsfhrmd7c6rsnt40ckv212gp1/34584956843.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/23eb3c77b57e70d9c6ee42c788e26871/fuzok.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m28e1ic6jf9pfb6brv7ndsht8p/tobomolubezezagevitepik.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716152e3263---poniwuledabujidajo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/4111928389.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ecpccs8iupkrct66bbdv9b8g4/61033441897.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2bf5d045c---negatutepozadigolofed.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a6f2c5a2b---10365012707.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd660bc7b---57645466421.pdfIn PDF document text
    • http://ibb-online.ru/f/file/30065895445.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6008a8c3---durev.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/buliwolemukitapo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607617eedd1f9---97847992306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 5096 bytes
SHA-256: 0b292c7eee2a340bbc5b4a032776523229bf0360d8666d8e3721d6824c072c57
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 11084 bytes
SHA-256: 7bcd1931e5117c1c416089315373d9318982e5ed1e35653993d4e438acc82850