Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad8ad90f7b0ee81…

MALICIOUS

PDF

55.4 KB Created: 2021-09-03 07:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e339028374bae54ea250e7b99f22745 SHA-1: b65c13a958d65d9e93f0c5e72caeddbe637f4b39 SHA-256: 6ad8ad90f7b0ee811e38d920fb03375ec83a98c06ccdb12426a9bcaba88e64be
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier also flagged this PDF as malicious. The primary function appears to be acting as a link farm, potentially for SEO manipulation or to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

Heuristics 4

  • 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f06298f0---xizixubowuzagokudim.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/99714896120.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4dajdsc6l192tul029m8dbeelb/20593655631.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c01da7b38---ruwifab.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/15306185153.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9onle47mmeppqigujcclbt0hm1/gefonizupafosilileme.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/fevifofuzaj.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/18964684820.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210803095857_a3VyaWxha2V0YXR1bXVtb3Np.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zukaketixuxakepin.pdfIn PDF document text
    • https://steammining.com/userfiles/file/33336502140.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/71445677445.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/36170985847.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097668ad613f---81598861982.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad079d269---vozexikazon.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/82024084962.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f188e35a172ed905d05731c3a1776e83/13715234174.pdfIn PDF document text
    • https://gangnampools.com/contents//files/28813918371.pdfIn PDF document text
    • https://iword.de/userfiles/file/bifatanigixobexisafotopo.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/kimuv.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba003a60fee---31426821911.pdfIn PDF document text
    • https://melz-feu.ru/upload/fisapokedidokaw.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/83cda6c3197bfcbff886c6b5e983e6fc/dobeserekisekedezape.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/fadezulogis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=james+thurber+the+secret+life+of+walter+mitty+pdfPDF link annotation

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