Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42078dc2bd0be50…

MALICIOUS

PDF

124.2 KB Created: 2021-08-06 23:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d75e7215feb1ade057cd0a569f5f546d SHA-1: d585601a5ce365ca2af85186fdd62bd798e3bffb SHA-256: c42078dc2bd0be50bdb716ae6c15f633ad6294ecfbfd0353f138135323ee5a7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/8hp1am7ja1ibv1asm8647qq7fk/napetodikapulej.pdf In PDF document text
    • http://www.hangmandigital.com/files/file/2965031104.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/gazujobojaboto.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2b500aa0b---vimewenevafinuj.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8564dc13---57217049816.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c005c8d1d71---61927278629.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/50421850431.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gobawakore.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/buis7t4842uvpco7o6pptat9k6/30239119003.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fifixajuzujel.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/59592341105.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/e8s4tee9mf67466l16l7lirsaa/bigofanepinipaximofupebap.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1a63e4ce91d83b7151c346b020dbfc08/13236531026.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c8c61a40---85197050565.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9dffa4eac---41358795618.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/saropozegalezivu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/31157518832.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/523cc6cade7de252ecd889bc2cf78790/12869856324.pdfIn PDF document text
    • https://mihalex.by/files/files/juduvagora.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/62267379489.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc90c6665---20865564649.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d00a5d8f52c8461de19e2b12b4a25026/82764404505.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9625e6d4---32479771219.pdfIn PDF document text
    • http://kasargod.net/uploads/file/50431213698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=multimeters+analog+dan+digital+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_off00017ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF5 10936 bytes
SHA-256: f8a79b16a4f45d409429b467d177e783bc4a4177cf6cc57106f260f888c63778
font_01_sfnt_off0001990d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1990D 18296 bytes
SHA-256: 762e2f9f3c3f3fb295b1c0be89b97bc404256f7f40a2577fd451e07e6104807b
font_02_sfnt_off0001c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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