Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7b4294e3438de2…

MALICIOUS

PDF

95.1 KB Created: 2021-06-25 21:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10bb99bd1696c7ec83ee0d77be181e54 SHA-1: 08782b2dbcd7c932a18000dba806a7b1ac7c8a45 SHA-256: 6f7b4294e3438de2872ebd70614fdd725a5d36890b58943d467d1c93afdfbbcd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609294ee13497---wopitenonimasiwupanuk.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ti4s701mlmt05pa1sdie2ifc08/jexebe.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7aa61171d4b8e8d4757f807c40509bd9/refupedumowivifubi.pdf
    • http://thegroverestaurantnj.com/userfiles/files/xulekifevisuxokorog.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/oomh0i53uei5ln12096ujgjr4j/fomatofodare.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2eed0b99f32cbc9a9809825acac857a1/ditodami.pdf
    • http://asja-doll.ru/userfiles/file/timumenug.pdf
    • https://247christianity.org/fckeditor/userfiles/file/mipawudizafamimibofapo1621169299.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922e1a8ec05---28222413008.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/h4l9dimo5ffotqrpjvv5ef0pm6/gawajarikikogedutepa.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/uss54fn68p50tieb9c38mj8ti7/11910076830.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f337aab42b---vowerupumupemelorawe.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c749598876---zipifakumen.pdf
    • https://n-zvuk.ru/upload/file/31103537584.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/viforozugidanexi.pdf
    • http://cdhsalumni.com/clients/28864/File/jewuguku.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7s6ah4sdvbhoehdg0iphjqpvj7/60489841778.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/bilemekowagasegifelobiv.pdf
    • https://ikuseikyokai.jp/ckmedia//files/58542106155.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e567ad6931---2189073668.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286dc7bf14---37197739833.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/romedodajupumos.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090950a907be---pozobunalufuputapeponosav.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160722f4878cb1---kuvarobawir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+adventures+of+sherlock+holmes+read
    • 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_off000111a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 16792 bytes
font_01_sfnt_off000129b7.bin
8b603f07ec29fb2ff5be28e703c479b4b0f115d237be9a7f8ac65fdb6481a15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 17100 bytes
font_02_sfnt_off000155fb.bin
084fb36d6ba53c9e14fcbf6c6a9f3e0ddc37b1c2562791fc47be7575a87de9b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155FB 10868 bytes

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