Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c94a0d8dbf1dd3…

MALICIOUS

PDF

155.0 KB Created: 2021-06-30 22:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebf050c9a06c76d8a1c9aa3804920be2 SHA-1: a79605899240c6300b2c6d12e5ca563cc9994b8e SHA-256: 23c94a0d8dbf1dd3a91958429a1f5f59785abd772d8a90991ac5b5486bbf5224
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://xn--80aaijzh9b.xn--90ae/documents/file/zakafoneba.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff41177b7---37021471810.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/cc078d3ae9335ac70c6cf9b4347f914f/puvufirineso.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dd82r0uc8ajsasjh77egrgqds4/sepufekonasaz.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/debagoduzum.pdf
    • https://noddy.nu/images/file/32195678098.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac9eb2b77---galuvifuwoliruxepetazo.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace6b495a4---pibexuteso.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ell8tjvrk7vdt1hfjuqkp9m790/ruvudof.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/76c778543ccf8b7dc4e1df7f37e2d236/39729947960.pdf
    • https://actorconseil.com/files/file/80915794608.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/8217155637.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/lezafejiku.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db5746c244---zaxukunona.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0d41f151---62382326356.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5c5a8480c256e3c5a7b54dc61174983/15538500190.pdf
    • http://mrmax.ca/clients/9797/File/41183861164.pdf
    • http://lg-palette.com/upload/files/93909017372.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7d7f224c0---sixuwolen.pdf
    • http://centronegozi.com/public/vipodidorugev.pdf
    • https://atcotourismtravel.com/userfiles/file/21882027066.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607353cec887c---dapaxuvelopajawifogerim.pdf
    • http://esistore.be/userfiles/file/14523162530.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dfd2cfe31---misovejofujuvafabepovil.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d1vckais51bojj2sjpv176au79/radomutojakogoz.pdf
    • http://testplanet.nl/uploads/files/74342634218.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=specific+deterrence+examples
    • 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_off0002007e.bin
ce78c7e95056807973f703c8f52e1e74f2b6b568de221c83c0da2952777c33e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2007E 10836 bytes
font_01_sfnt_off00021974.bin
51658db3d383608839c86071fe4be0921ca9e68fb2c871c5a3c17f8e4e7a25d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x21974 17192 bytes
font_02_sfnt_off0002461e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2461E 16792 bytes