Malicious PDF — malware analysis report

Static analysis result for SHA-256 9006953f86f99118…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 07:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6731391729ce639e4a21b96afb14b967 SHA-1: b7a2135670e5095bd50620c9575130808e3669b9 SHA-256: 9006953f86f99118379c4e27fd5dd0c5dc5b9e1dbc8ce4a56e3d5fad988a2039
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a link farm and a browser extension installation lure, a common social-engineering tactic. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation to achieve its goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://iword.de/userfiles/file/benabadigugojupata.pdf In PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/55522807420.pdfIn PDF document text
    • http://sparkpro.lv/content/file/22478685055.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/36248615582.pdfIn PDF document text
    • http://trevorhannant.com/xafokuvoxaxiluxab.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/penaxejiwudovokadiliwose.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c090255b---fapolif.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kufexazofejameloxijufovu.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16422536618.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/jegufenew.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/869c08e590dfc30cfe468d79e460264a/vuriromukonupufixa.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/40425109152.pdfIn PDF document text
    • http://grimastone.ru/files/lafotaxureduk.pdfIn PDF document text
    • http://gr-chem.com/upload/files/43922709651.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/59900220373.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/nasafarafuvuw.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903045016.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/fofofe.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/veritagizaxeveguxikison.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f5c051162cd166ca9fa78632ebaebdae/52790806209.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rejesu.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/80848120085.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/dezubixitimizowug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=app+launcher+icon+generatorPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 18212 bytes
SHA-256: 922aa3efba2f0fb1b6f492b84eb8ff25747f2e04878892c4deafc7c3fec63e3d
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 10568 bytes
SHA-256: 49afa986ffab7b33114b4512577831873e5b0883a10bea78f16bd7f48f8150c1

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