Malicious PDF — malware analysis report

Static analysis result for SHA-256 6644b4006dc7c163…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee05559fba739207d6549e10e9d54943 SHA-1: 39638160ece026e74a4315d49efe972aabbff76d SHA-256: 6644b4006dc7c1636b437808acdc3057eb33323926cf6d6ab02309881105c5dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2a326c41dd0115b93bb40d8ff3f8bf41/21311007344.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6029b7a5f5cdf8215b71f48da1845426/38506660173.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/76746355b75da7d4cf88938043247338/fukonunatufoxoxu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc6e37388---9820106931.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nexabumuduperenitogafonu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sogebidudevomigezo.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/19477359785.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/bumuxanugexozefapalomo.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5a40e1bd29ad04a48a9d124b3a0e254e/15803490247.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/46353199021.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/66f1c0b185a411e54ce3332c39c686c8/fopepixoje.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/fuwuvofuku.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/watigowijotezugegukimajig.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b85801b526a---71809255989.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a8daf1b578cf2803d34f1750dc8e8575/62553974819.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/vakaxadazu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/13702702957.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b964679b3f05aab973f87a2d61ee220b/35812244387.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/09e5be87e5dcdf38f28b1f81fef05a4e/fapelofisiwamuguseweligar.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970d26e9791---moniwetirijupik.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e7de788712f80c68c34a04092a2cf0a4/juremefo.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/865918462.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/33650473063.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/27329821580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=herbario+de+malezas+pdfPDF 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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10648 bytes
SHA-256: a140f463315deef440b26140e87c72cf6a310b522f8226b18b100db2f9b5ba9e
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 18668 bytes
SHA-256: 7bb792a6496833056e444d11bf4710b3968f95104f88589afc485e4a28629ecc