Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aa3149f7c359c5…

MALICIOUS

PDF

42.0 KB Created: 2021-06-28 15:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b48d56bc75e6f7683e460a4505b0884a SHA-1: c5cd31c7f824cc288241e77d4151c3c042ff42fd SHA-256: 21aa3149f7c359c5633b711756bb03ddd9a094d2892e621ff873e9d94cc6c87b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7348

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://drafthe.ru/uplcv?utm_term=ds3+game+route PDF link annotation
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e5598f11d262c7019faea8b43d070b1d/fofebuvizokodezeb.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f1534a7a---84370110875.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe6b9c0f7---13198723718.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2bc1908a5bc2eda972609216ec8f9e20/vudusuref.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6da2397ccf---75491224932.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/ruvatifisonuweru.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9694cbd9c---folededefosesamat.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/5508042229.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072da143a750---dafufegawapupotewogegad.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/bewajejatevuwunizaponuru.pdfIn PDF document text
    • http://charontrade.hu/data/file/tumuzineke.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c30e46365c24c7184d34e843d389f179/70517182613.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc592623586---46491794031.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cf6e84dafa8f607ed051afaa07c068a6/zexaxedofakem.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93975c0679---68968017392.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dbdd9ddf0---88692834891.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/gn6soispr07qh7t9mf9p34daic/96088558856.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4212fce8b2---46787333684.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39724789651.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/xadigokiguvefiv.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca906ad083---40210268775.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/90ffnj7jpkr6ngrdn00utcfuo1/tureju.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/22962450319.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/57338645405.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/211628284532.pdfIn PDF document text