Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc87faab38badb0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 05:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8435773910006426e2505c805772858f SHA-1: f3e95ff3603716379dc2fb934f27b27cfbc56124 SHA-256: 6dc87faab38badb0231c6051997590f41aa3659a790d80fee10955ecf44fc610
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/9c1bbb6696ce4b3df79b5f7ac07adf75/mazitidovidibin.pdf
    • http://momsystem.ru/public/file/kapabapitimim.pdf
    • https://malashealthcare.com/userfiles/files/70375939403.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f6675fdfe3733dd285e227e1bc104dcc/67824468813.pdf
    • http://camonetinternational.com/files/file/wavotutojoxuzewuwivibiga.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c69e190f---tipufazozazusa.pdf
    • http://ateliergermain.club/sites/default/files/file/lulene.pdf
    • http://kppzp.pl/userfiles/file/xalapibulu.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/39c9d3f5745368b5a7e286dfd05baed7/87862671162.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cc1a835bf3d394b32d799f0194faa36c/jaxuwewomabesipa.pdf
    • http://lionsmarsala.it/userfiles/files/sibemisikulivu.pdf
    • https://magnettoptan.com/upload/ckfinder/files/43559090784.pdf
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/58033407629.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/99768809222.pdf
    • https://pezenasenchantee.fr/userfiles/file/sidavufafotoribafide.pdf
    • http://disonde.com/filespath/files/20210909150552.pdf
    • http://karinameal.com/imgdish/files/zinifuwanubofopu.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/sakoxifipagagetumowawerad.pdf
    • https://solener.info/ckfinder/userfiles/files/girevaxewezagupaxuja.pdf
    • http://sinsg.com/files/fckeditor/file/27517949442.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/penibaso.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ff977bc5---mebetefuserixofojojovasoj.pdf
    • https://beyondpins.com/calisma2/files/uploads/fivomutagexiwirakij.pdf
    • https://almuhja.net/ckfinder/userfiles/files/62266914370.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=jackpot+party+casino+slots+cheats
    • 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_off0000dfba.bin
f52187f19844552fba0f5e91dc8346c48a323b2047ef8dacbfe61597ac83e6cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 17816 bytes
font_01_sfnt_off00010e46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 16792 bytes
font_02_sfnt_off0001265d.bin
998ecadf872a61e9fd52b3817b40ecd3e8cd51a141a33fa9b1bfbc7ce7b64b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 10668 bytes