Malicious PDF — malware analysis report

Static analysis result for SHA-256 155202f528f17bb9…

MALICIOUS

PDF

75.2 KB Created: 2021-06-14 13:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed490db073347cdcfd836bd88823c8d0 SHA-1: af2e491e658267c3a818c77784f943904987f105 SHA-256: 155202f528f17bb90968866f80824003fc1795a770ae6804ba7aa71f0188fa9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://smidgel.ru/uplcv?utm_term=transformer+kva+amps+chart
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074111cd4cff---15984761909.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4aa746a75---bikinamota.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ebeabc454d400c78f986f5d259b33f55/gesametewuw.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/74037462b14400573dcfbe49a5348fee/gegibukigapuxizesuzatip.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075fae55edb4---68440370241.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160869dd4ebad2---terijedejozozodafopolelu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99a1daa2a---bupefixozinawiniro.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba0bd1191---23441050409.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/272938780.pdf
    • http://elm3rad.com/file/radegij.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c1b9332a650d527ad57eb196f325a333/wumixenazajef.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608035ad212b9---33976548960.pdf
    • https://webmenuplus.com/images/file/51999393448.pdf
    • http://nensi.si/upload/file/63359947048.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_off0000e8ed.bin
1c7d769366ebc26435fcd43fd05b9ff6eec09ea81682e7010f3aec4f6dff32e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 5296 bytes
font_01_sfnt_off0000facf.bin
234d8de79fa0f5084c6ecb493d70578c7a075af8422ae1609b79e9d10eab9c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 10576 bytes

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