Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce3681d38aa2ef0…

MALICIOUS

PDF

197.0 KB Created: 2021-06-23 19:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8944af59d5f34fcf89f264368dc39542 SHA-1: 484abbe79227828b16bab60dc94c1a600ae91061 SHA-256: bce3681d38aa2ef034a3d4affffed0edb28f4e774cb6ee12c00219be5c672e26
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=resident+evil+5+walkthrough+pdf PDF link annotation
    • http://isgsrl.it/images/file/93474732383.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd29fcab247---56101744314.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a9d2c07db78d83be3f8cc8b20280e213/70363360341.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1572324d85f94d3cee7406f624703fda/zojalipi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48182f007---tesisu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6a0bimosc1o5sv6o15isp3ld4d/tuzimaxabizakiwotekud.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1623f93cf49cba1d75014913f6e4e327/wodomolupofawaza.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vadetabame.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/745cb2fdc6b0f031111018e1c68b5185/remuvusorudom.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03e428f5b---48021905928.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/82591420239.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b92a447b9b6---21908924975.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210605_789C746D727AF9A2.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/6094047819.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076aeddcf267---komisatalubuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002bf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF3C 5532 bytes
SHA-256: 29e29e2beb56f94e5e9afd70b8a62b0b5ffdf85443a831919557811509dc98d8
font_01_sfnt_off0002d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D21C 10964 bytes
SHA-256: 5f673dc2798717f9fa2955d98f5ad847df5e4e10f353c045efd8f6345d006a88
font_02_sfnt_off0002f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F784 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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