Malicious PDF — malware analysis report

Static analysis result for SHA-256 734b20c2bb4e10d7…

MALICIOUS

PDF

75.0 KB Created: 2021-06-14 16:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 288d6ce4406a8e065128917a2b6f4fab SHA-1: a350d099d068f30be507190f92914a77e68687e8 SHA-256: 734b20c2bb4e10d72779f0c1ecd4d8d30319b2a42a4dfc119b7c218cdd2d547a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document's content, while obfuscated, appears to be a lure related to tuberculosis, likely intended to trick users into visiting malicious sites. The presence of multiple links and the ML classifier's high confidence score indicate a strong likelihood of malicious intent, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8338

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=periodo+prepatogenico+de+la+tuberculosis PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/630008c039f481385bcede8b0fc3c3fb/xoponoxavugemorep.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a830d5a794ec11b459bfacc262b48712/xaduj.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f505c276ea62e48ac670b0b6b46712c3/53611816868.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/eb1016bb1344d98e78dc7e807b796c18/lenij.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/64853308982.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b807e895---19670425330.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/18f814960a97fea103407bd678e8ebbb/wusudomam.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/365d47496c8c81f5916153b92b00c078/jexamoluguni.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/54535324513.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c70f02c3---wesexidaba.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/bewazapaxidego.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a71cac003---dutamibizujefuvutujez.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82fb8b903---sakagavuripipaki.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2d74c9a78cb83da5c247d5d6510cc779/morati.pdfIn PDF document text
    • http://innotack.com/userfiles/files/48231227649.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9omb5344flrsn14mqn7aetea30/76355559923.pdfIn PDF document text

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