Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e56bd61e2e9e97…

MALICIOUS

PDF

85.8 KB Created: 2021-09-30 17:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 429674ae1f1818dd5be280514fc0100b SHA-1: bbecb5f14cb9f76fa6f74002e9fdf352409a21bf SHA-256: d6e56bd61e2e9e97bd8647dfc0c30d99091d4be32460df9300a6bc768f36bca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. Heuristics indicate these links are used for SEO manipulation and potentially phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://infrive.ru/uplcv?utm_term=ben+hur+2016+watch+online
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614d63bbb891d---sujoxewok.pdf
    • http://kmsenior.org/file/files/45994765231.pdf
    • http://celeb.huh.hu/UserFiles/File/wajuwozefisizunix.pdf
    • http://sinching.com/uploadpic/files/202109141447093430.pdf
    • https://aildf.in/userfiles/file/nidaxetesutonaror.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141cce632c10---disokuziwubutofato.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210904_8F1E03591391F3BE.pdf
    • http://toanthinh.vn/webroot/img/files/wotogurewijete.pdf
    • http://surtek.biz/image/files/20150329_023646.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/duionle3g1nk5aj0jjgt175q83/sawazobupilesupanun.pdf
    • http://ngocvietbungalow.com/upload/files/48796522415.pdf
    • http://lerucherdesanges.fr/userfiles/file/3290017883.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/efcb0f061712cd0c899cdebe6f6651f5/xedobifag.pdf
    • http://muacuoi.vn/Pictures/files/71687949456.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161558584aead9---55028547412.pdf
    • https://sharks-cz.cz/images/file/25934951559.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zexube.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/bibonuvo.pdf
    • http://zulassungsservice4you.de/bilder/file/bavifebariberejunog.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/14361038624.pdf
    • http://www.cerathai.com/image/upload/File/79992316712.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/dezakalevuwoxifulaxotu.pdf
    • http://eurolocal.info/sites/default/files/images/file/81691021210.pdf
    • http://telekommarketing.com/firme_data/files/buredo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 16792 bytes
font_01_sfnt_off0000df80.bin
a98c8d4b30b7663461b161daa5d8ae7015d18c2d56bacadde7946ffc3c224ab8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 22280 bytes
font_02_sfnt_off00011915.bin
8304f8b31ee7aacf31cf59762b6dc3fc9f646e524fcddb3494e51e2460ee953f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 10860 bytes
font_03_sfnt_off0001323e.bin
d86d50c55c476302c2170f44f5fa8214ec3798797197c1d9b351885c8a1e1c19
pdf-font-stream PDF embedded font (sfnt) at offset 0x1323E 16300 bytes