Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf5f02724bf4b4c…

MALICIOUS

PDF

74.8 KB Created: 2021-06-20 03:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7cdd6529e5e4315e65e9b408e7d2110 SHA-1: 30d5435dbcd0793ad0b15c49665c177c4dfc9102 SHA-256: 1cf5f02724bf4b4ca29156b7dbde6ea5c0696f31df77b3162777ba58a8dbb92f
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress sites hosting further PDF files, likely as part of a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading malicious content under the guise of a useful template.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c66737ba11c---32444644220.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/4g6jtkkmjhef7mf35vadr79hn7/zevewudafubivemol.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf3973714---sejuwivifilenozuzewe.pdf
    • http://tpokebar.com/uploads/files/mapamojise.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160897b3e1bf34---76559064124.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d803750f---muxolomerozobigemi.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/71rgfdrl8i30imf2jq7a3cgdv1/32071139794.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9365c5e1bf809bb3de0f8e0987dd56b3/70372840759.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7fe6cae7---nevijinodibiko.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0dbe47aa0f---virofejiwojesubutirasevob.pdf
    • https://lawina-radom.pl/files/file/67740006975.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9cef1c22c0b20b5d840d1575a951735b/favowibamitusojesomiwefen.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fce173da---rutubowabu.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a544f4856dd---luwuw.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/388439a33cc48691f18bf7896c67f8f5/28280111211.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d40d1870d8a230387826c10374d82cc0/96156182643.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l225jpk363e9jc54kqpsrb9o2a/joxomeledoke.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/47376655017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=timeline+gantt+chart+excel+template
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c5.bin
2807b6cdc487f3464239c396a27fee6c2cf3c0459e9d56f7fbdb4c50e7af36d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 5184 bytes
font_01_sfnt_off0000f946.bin
6d767c165482573058f2f14de158d54d3628aa34e14e4d68c2e8c4122fc52222
pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10872 bytes