Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a353cf0231eaf76…

MALICIOUS

PDF

73.2 KB Created: 2021-05-10 11:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a08ea74e7e2463b0b992e3d80ed098 SHA-1: 0f698fbd012bc06fd957625506de3ad374e69900 SHA-256: 7a353cf0231eaf76054a0a1f67b0f5b7cb24f3e1ba4a0b091cb8055a813fe50d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609286aed8e74---sawidukilisorifupetiteluk.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088560570e13---faxakomiguvutapik.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4b7e2a0b08f8453d4297733537e4aae3/71023267234.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8977c6393---kavesaxurivipatogavuno.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b396e96104794497031ec2ec342d15d8/zasugedumufulijotijawo.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ed9590dc86fc19b45d32a0a604814ac0/60310106468.pdf
    • http://accessprecision.com/userfiles/file/miwalevamamuzudutesag.pdf
    • http://strandedtattoo.net/file/55058445213.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/1d9b4dcc21b09476c2e47b886283be56/64311772062.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/19780347059.pdf
    • http://dok-vo.ru/userfiles/file/32261648761.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ef5d1ab32---jorabaf.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074939be8469---nonesuw.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/94baaa92a3824f96f87051accaeb2710/xakibuwexemulona.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hypertension+guideline+jnc+8+ppt
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d751.bin
435e47f9135271dac3fd36519d06057c950cad62ab65ac481218708ad03c2381		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 1604 bytes
font_01_sfnt_off0000df78.bin
6bfae8786912acd148b0162b0795219ec88aa4226f7c7e70f46fa91953ad37e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 5364 bytes
font_02_sfnt_off0000f1da.bin
45a84dc052f02e615e2e03a19bec2bc4c38dabd73a05705119e841f553d3c464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 11012 bytes

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