Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a516272e39c7dc9…

MALICIOUS

PDF

182.9 KB Created: 2021-06-25 02:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f256d5da62aa3db61f0adeed08d95bf8 SHA-1: 163fed87f20c0fef462661db4ef547a36e3eed52 SHA-256: 5a516272e39c7dc9f5d9a03aaddd17bbdae9af2f76a42151534005df2e68db38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9220

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c817e7e992433e063bec0db174b45cba/13333979401.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3de9c5bc---3561489178.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6959bba7---towuxuvumep.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k7fjjm8sge5u95ljcoutgu092h/24067663843.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a06dab73b---80030225800.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb7fb0502---turetatufiwazidilataxukid.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/11659567067.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/23549638945.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ad1e03d3cfd7bc26c0a6555bd41f587f/76707395050.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/925bbd140d3a93dc5d406a3ea74c3b46/60652279500.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/42165100247.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a3389f4e---kinegilizerepedi.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/juwosuwutolusulirurin.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nbqj2c54c4un6rb3o3nq2j9qjs/limubefixaziriluve.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a08732e86---57814037027.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5f920e025f090a4384d81187ceae3d04/pimabegagojuwanoriwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+avengers+pdfPDF link annotation

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