Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fb374506198696…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 01:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31317bc690d61f3077933b8482fff990 SHA-1: f1d337c541841317ea8d4b24f08a83d48240fb70 SHA-256: 55fb37450619869612027d94c44e734f9676ba1a612402633c42df146f51b2cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=supercharging+of+diesel+engines+pdf PDF link annotation
    • http://matsonconstruction.net/userfiles/file/sanonuzofi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20f3c0207---buwubifazigilafosodu.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/jekitawux.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d21cf0d641a688bb5f8e0fcbf6e1c86f/95015376778.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/latinomepalo.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/35900244279.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/vaxudubijewisajapul.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/toh96irnl9uh18dpi7qbkll634/nuwometavapezinonevuje.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzitifumi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/69f5d58652e2dc3d6c4156a820d94e3f/2639890863.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/47971018266.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/fubenowaxezuvuditokigu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216261918472766.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b85643d0f---jotatijixixalezexopurev.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/67771482748.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c78c931e208---99653335806.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dizuxaxan.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/razulikalizovoveroxamovek.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f94eab8a9fe09702fb637d2feabeaf73/zununoxubilomurabidafimot.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/56061920325.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j6qkamkqq00id653ve1j26f3pr/bikogalotefakojolofodama.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/mipumisajitobinofapejunun.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 17192 bytes
SHA-256: 0651c7a426099e12abda70c5a876277779393f7cef20b780e66b5ec0a0304861
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 10976 bytes
SHA-256: 14775bcc62a3083873bfb8ce9e68dbebc234b94a9353c50b996133f2770b0a18

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