Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8705231d81ae3e1…

MALICIOUS

PDF

38.7 KB Created: 2021-07-08 00:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a91fdbe96a7a091e50a1db4d2fc5cfb SHA-1: 3030fac8c9dcb9b3a8a60a27c03f24a55d2e126f SHA-256: f8705231d81ae3e1d70244f18518633b744f1e99dbdc2bf1bcda4f1b5e69ab35
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, employing a screenshot to obscure clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various domains, some of which appear to be compromised WordPress sites. The presence of numerous external URIs and the ML classifier's high confidence score suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8504

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 38 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://synerhu.ru/uplcv?utm_term=outbound+marketing+agency PDF link annotation
    • http://haai.org/upload/file/sujuvadapolisixupumuvok.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed25c7113---25905672103.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/lesade.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/labeboxejavifelafevawiw.pdfIn PDF document text
    • http://deauville.ru/files/file/ridagedifewafuxomivir.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e53a4e1c---58015800436.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/36965780141.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0eb23c8d9f28f2540795dc2081772385/53933515669.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/sisixijirirub.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f30e345a1---40265125251.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35dabff05---numijebotife.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/75122502849.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/bozifidojotesipijovo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0124af8f4bf98a561e10bcb9cb74a5bf/39181875412.pdfIn PDF document text

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