Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ed34600a46ac85…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 10:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee3a94a35f6d2d80df2a69e801711684 SHA-1: 6a41dd486240bea9d2a7ee87548ff6de9adf67db SHA-256: 65ed34600a46ac85be5683d2d9606f5a6595879145fde815699cc53dd1813b7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous compromised WordPress sites, which in turn host further PDF files. These links are likely used to redirect victims to phishing pages or download additional malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=examples+of+conflict+at+work+interview+question
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/o8i1qrkqm70n75qcp9s455o8i6/gejexebekamapubunupof.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e6a2aa338013778b806cd9589b1d4c55/31451488143.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c3b3857a8180ea753001a421a5035b24/88314547741.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/flt87jspblftio4nti2lusnlpv/46356029284.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c5696bfdf7ab229ef5e232c4d7f8f0eb/pavafipebepit.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cca81bd1b59---46188284773.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ebe2f40b9a5e28eee2ddbdf14d70f23a/lunodoxaledexamura.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8eeaa4d5093f0454f6e9ddea14cc50f6/7861702548.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfeb4a450a---piropudajolodozebud.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/tamoxedobo.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16098339f0fce6---togafor.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/83f88cs38ipqgobp3q6ai37uvq/73508019897.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840ad9b8bb---82266407535.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/susixojurewezisorepurox.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9078ae52dbc9c0611c535a3205485934/38388568302.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08938acfb4---gijikefusatin.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b098da00a02---zojezefixofiboxijeji.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nkaelr20kptk7khm3relrslf7u/jupivebafugudukegedido.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9tpivlfkcbf9qpvld8e3medrtq/menawikamirilaboderumip.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/44fdce5b88ea517366c54576dbc58440/menetozetoxezefuned.pdf
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/43246591393.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f78465096179b9e472659ba58a212b54/52250844034.pdf
    • https://samngaimarble.com/html_upload/file/87692623161.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 16792 bytes
font_01_sfnt_off00010380.bin
e8b44a8ec413f537cde4173604274aee2bc8f35a88324af7abced548e7527c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 11216 bytes
font_02_sfnt_off00011dd8.bin
7a39f3825dab41f02144ab04903ad6f4221fdbad5dbb8a963cb5aa5f021e0f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16676 bytes

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