Malicious PDF — malware analysis report

Static analysis result for SHA-256 307b7c21f226d5e2…

MALICIOUS

PDF

130.4 KB Created: 2021-09-13 04:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: acb22d307588f9d18ca2d000a581a8a2 SHA-1: 18bc68986104fcc8bf22be297cd9ff33055890c5 SHA-256: 307b7c21f226d5e21cdcafab38cfdaa0409cba949c13f8ba2588ad7609c8e7a1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, directing users to other PDF files hosted on compromised CMS uploads and disposable hosting. The primary attack pattern appears to be luring users to malicious content via a spearphishing attachment, with the embedded links serving as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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://synerhu.ru/uplcv?utm_term=eac3+audio+codec+mx+player PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7a5aca40---gozodarulakego.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/bober.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/totawukarutifevigamikeg.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/dorural.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/fuzajodenunisariwesug.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/sarimezej.pdfIn PDF document text
    • https://educhina.mn/editor/files/revofiraxok.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/fogosotatimaxolewadi.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/54923544644.pdfIn PDF document text
    • http://imoroz.by/upload/file/47145535465.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/20887726050.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/17047101237.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195147288337.pdfIn PDF document text
    • http://espokebar.com/uploads/files/norobiturilem.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/37704337987.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mowazezuwepomogeniga.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135663099c90---46542683897.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/3968815444.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b1e7sep68k3ehv9a2j3g4cdsmf/gakewod.pdfIn PDF document text

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