Malicious PDF — malware analysis report

Static analysis result for SHA-256 2681fd9a31ec1437…

MALICIOUS

PDF

53.9 KB Created: 2021-06-15 20:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 82320341b4e43d37d8930f8c4fe0d232 SHA-1: 9e0eaec5e86c83033ed795e86a0d5bf13d6ebbd8 SHA-256: 2681fd9a31ec14378e93503633262424a5e0746a5502e8582da70320b003c4f6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and appears to be junk data, but the presence of URLs and the overall structure point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8177

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=casas+math+goals+practice+test PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lhdh0ntveqa9mrfkseo3amfpb2/56645592942.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/cm2ke0kiqqf8mjjrcno4lmjkq5/bekejogumig.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/levabosetujizuvoganogu.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/29903900314.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ed32f573---76645407340.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/06087725b699b6bd1b2a716e90d81610/62741157809.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/zimeb.pdfIn PDF document text
    • https://ka-base.no/images_content/file/60955678008.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098cdc8f312b---mulifowajabijij.pdfIn PDF document text
    • https://efnnma.org/files/file/37906332223.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d6702e8db5e5528fb30c0cf311217af1/tedekaxidanetogosi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7bd299c97---38399276689.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/j464spfjvdnj5115nhauaae86a/tituwadeburimisusub.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/v4msgfaapfrik3bhrep0ved7kv/83562706286.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc45aaef49---pugepew.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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