Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d1d96a84456887…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 16:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94caa25d3b441a15bce57a9118ae0097 SHA-1: f6d97a1a379304bf071855684b2e4a9b4807182c SHA-256: e8d1d96a8445688762362e87a7faeca7534efb213d21751e03014655686cfc26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5329

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://vhcvietnam.vn/ckeditor/images/files/nomusenofifunewis.pdf In PDF document text
    • http://laxycoffee.com/upload/files/89287588939.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zaloguxadajasopisixibup.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/xoxawunomidikojiwana.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/kubitirujodanogejidak.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1d63e92f4ca3f74f1097b31360a261a3/24993141645.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161372984f1ad2---35751572236.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/13175248572.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/loroge.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/45293804915.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/95449922039.pdfIn PDF document text
    • https://congchung7.vn/upload/file/jojulu.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/furogilijoz.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/92703276492.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/35857779314.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16147490581693---wakodebur.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb40190740---xuvolonefubagimi.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/pudevub.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/pimajifuvi.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/zuwenejenejabod.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/45079665458.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/poderibagafepa.pdfIn PDF document text
    • https://penzion-palice.cz/content/pibabivulinagovilixisudew.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/zatavaworipololeniziwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=friends+season+4+english+subtitlesPDF link annotation

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