Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4db07e0c66a58ba…

MALICIOUS

PDF

91.8 KB Created: 2021-07-25 19:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41f178716dfb067d5f0f0b0154d104d2 SHA-1: dd2e9e1d907745c68bfe3e18bd2b6caea1f500f8 SHA-256: a4db07e0c66a58ba24e5ef2b4b197706f22191b8ac00d8433c8ddbabd61cbc06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mv5iif0ev42hcse01pg9koscuc/90643281848.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4721662d---19405171783.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/jixomebawof.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/56503979995.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/83166823985.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d557868839---11750028180.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c228ccda1a70f0dfb9a170d96a88e178/89971472395.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160791f3b76ed9---puwazumegejimuxe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baea24d8294---rideputitebow.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/70b564dc4d5d49f5b5a49d100103e77e/45216563384.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xurek.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/68743575521.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rusakud.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fb748e21e874479714cd269ba81c36c5/deruxogabifiranajegewu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/70647657661.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/lefimuzalagupo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abc3fbe1bf3---mekovizebipupo.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/niwajugisalujivos.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a759b1a4083---firetowabadise.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/povuvekurarabot.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/dudusawe.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/90413049852.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160990cb53c453---9402424458.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43188c3a06---10774647899.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0faa6622c---14161357581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+monkey+testing+in+software+testing+with+examplePDF link annotation
    • 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_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 11192 bytes
SHA-256: b4131884c1b24bf07aff0cf962db52204e0e27eafd28704e499822954c8fafaa
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 16956 bytes
SHA-256: 795952a317c5894aac80daa65ead95cc9282d50e613a8bbd1789bd1ecf226128
font_02_sfnt_off00014794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1