Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fa7a2342b65cb0…

MALICIOUS

PDF

47.3 KB Created: 2021-09-09 06:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc72c05571820578a9bd7113f6f275fe SHA-1: 2983fd3987b8c81de86cd126107cc6617045424c SHA-256: 51fa7a2342b65cb01b4ec7df7ba6c95bf4ea323420584d38d7a44017ca5cff7d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on disposable or compromised domains, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7391

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 http://tomdythai.com/userfiles/files/povozirokuxokaka.pdf In PDF document text
    • http://gyogytornasziget.hu/uploads/files/83831275629.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/54452855846.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/47114662922.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136471bd21cb---37967595223.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/kijubezovigutu.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/zowidizarig.pdfIn PDF document text
    • http://dentistturkey.com/image/files/vatired.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/ninileko.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/92598456846.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/desoduwurukiduxowawiw.pdfIn PDF document text
    • http://citranco.com/users/files/tanuv.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pikepaxexugatijalikuvod.pdfIn PDF document text
    • http://yejida.com/userfiles/file/19131910058.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161386bf5ddf6a---pefeloziponefakoju.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6f78208qcia9nl6g236mj8sgs1/musumumifinunajiji.pdfIn PDF document text
    • https://trainova.com/userfiles/file/gusifesi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/witoxefuratuwuzuk.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/xebom.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/23827668835.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/81368380859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=find+the+parabola+equation+with+focus+and+directrixPDF link annotation

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