Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e67e0e55738738e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 16:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6a86e1f49c8a41a7614085c434becf8 SHA-1: d7e6dfa3b387cd2ba55468a54f40413ef4f50ed6 SHA-256: 2e67e0e55738738ef3e95fae6c38123d6b24fc7a63607744db70490dd7b52f39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to exploit users through malicious redirects, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610f993d29b0b---jugezolawikesenozugep.pdf In PDF document text
    • http://pressvaluation.net/userfiles/file/tupexo.pdfIn PDF document text
    • http://jaatkinson.com/userimages/20343783197.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/29348380873.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52bcb1f9b---85297019812.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af75e670b39---78355408161.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/39763854246.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/mobarewudirisonagixe.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/23374915246.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081421c074f5---19397133427.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/33197140330.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/55q2nemu8b2de9ur9hqs24l2fv/90608216288.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79750eab74---26291777439.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/dasagataxege.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/3313250862.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v3o2d388sb8i7o7dk6qhbcdsg4/jizow.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/31qvojlg3lc0n3hi650qhoppmo/13916603592.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/19871063050.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/07a47edaa99b51cfa88a3b508709d338/59754334196.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/57692782885.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1584742c---19408205367.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc88d5650---zowuwawegatif.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1c778176---10430453164.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160875078d1075---kigolakeparosavibif.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44021613173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nonalcoholic+fatty+liver+disease+a+systematic+review+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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 11128 bytes
SHA-256: 63d4f74bdd72a633d3217550eae80ac70dd8e6439045a66cbc6bfd70efe74de8
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 18076 bytes
SHA-256: 667bbb9c33db72745183cb74a8c648efd4ca24b60ab0638ec7a6ce390ee7a610
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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