Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6cb0695ea5a557…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08afdef3246e2d861792bcbd21738e06 SHA-1: 0bcfb29590ea9262b3f9bced5ea91502170b2cad SHA-256: 3f6cb0695ea5a557e1243bad0de864ae76dfb5d6928ed18d4d7e86128afab4d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9d9d510201c37fc6875aa117f0b891df/kejetugevepotafawofu.pdf
    • http://sportschoolindex.nl/images/uploads/49628081252.pdf
    • https://kaktutzhit.by/uploads/files/rexakowapesin.pdf
    • http://baaningdoi.com/file_media/file_image/file/76737258736.pdf
    • http://baoveantam.info/upload/files/80657260580.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907002650411120.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/wexegoz.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/75731327105.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/19453510496136809812dad.pdf
    • https://valstybestarnyba.com/upckfinder/files/nebunavoge.pdf
    • https://curvy.tw/upload/files/vogamapenarupepoketax.pdf
    • http://china-baby-clothes.com/d/files/bemujobujesifivibifuwim.pdf
    • http://suurelepa.ee/data/file/78733487694.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f7709970059304df9d81635827efd264/8492219992.pdf
    • https://shunnasato.com/13175976789.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f25614f8---81121626078.pdf
    • http://crmrealty360degree.in/ci/userfiles/files/jesofilefamipa.pdf
    • http://jocoseatee.com/userfiles/files/nuxaneguwigufojo.pdf
    • https://artedelvalle.cl/gal/files/file/1012022542.pdf
    • http://jatechkj.pl/upload/fck/file/gibesosopezawinurafux.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e84067ae---6361212066.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotet.pdf
    • http://tjsyjdq.com/v15/Upload/file/20219112011276726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hack+shadow+fight+2+max+level+52+full+coins+and+gems
    • 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_off0000d239.bin
36549a0e1cfe07558f28cb8778a91b37fc5a18b1ac698bda56aec14a9eb0d930
pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 11516 bytes
font_01_sfnt_off0000ed42.bin
1931274b0d6356030dea19535fdf937a0572a148e31505e04617ab8efa8e70da
pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 20660 bytes
font_02_sfnt_off0001249a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 16792 bytes