Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a07b78f5c7d5fa…

MALICIOUS

PDF

91.8 KB Created: 2021-09-18 00:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7306fa65961365c47c8bebcf3064bb07 SHA-1: f5f3e88a877b4d6f1ae01f4de7bd9f0f84cfb13d SHA-256: b2a07b78f5c7d5faaccbd7777ec39701bdf16be6e32faf1d9f543fd72464413b
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable infrastructure. The presence of numerous links and the use of compromised CMS uploads suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sindicav.com.br/ckeditor/ckfinder/userfiles/files/22140512942.pdf
    • http://camelliafb.com/uploads/files/202109061450527582.pdf
    • https://ppkh.net/userfiles/file/tereganuvezotowuwewef.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selurujogi.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139090c442c6---zavutari.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/94270304833.pdf
    • https://privatecambodiatour.com/userfiles/file/89502512814.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613654b5b3a7b---58683441483.pdf
    • http://hastensandbreakfast.nl/userfiles/file/xejadenozakokopigud.pdf
    • http://thinhhoanggia.vn/Images_upload/files/59370459216.pdf
    • https://zhbiotech.com/CKEdit/upload/files/41551833175.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516b155fc6---bokitalumepaz.pdf
    • https://akgoz.zemta.com/uploads/files/76413268227.pdf
    • http://richardchong.com/userfiles/files/51006462279.pdf
    • http://studiosimonepantaleo.it/userfiles/files/vijadisinibasolitodenus.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/segoxebijufegarolatetema.pdf
    • http://salman-group.com/userfiles/file/duvofidojozavimobamusiv.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/93294959998.pdf
    • http://fantacyhandicraft.com/userfiles/file/nilegetezogigejujelaxo.pdf
    • http://turksebruiloften.nl/userfiles/file/gajonilobeza.pdf
    • http://falconltd.pl/cache/file/86482144866.pdf
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/tanefovemovi.pdf
    • http://373113.linker.tw/files/bitij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spongebob+coordinate+graph
    • 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_off00010394.bin
621f065ce7feae3281036f620b911713ac886a05f530b72ba8be6d8d8957c0d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 17580 bytes
font_01_sfnt_off000131c2.bin
3e4e3dc0475017af79a3414b3aabf1f98e43f8f5d55a156edcc267bc3220914e
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 10796 bytes
font_02_sfnt_off00014a25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 16792 bytes