Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35a3bf2d52d2877…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 00:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 430931d8c187b665e9462db324f7b3ef SHA-1: 09f8db759beda1a6c1963629a0dde0f8298cd027 SHA-256: b35a3bf2d52d2877366c5433dc800e4094ffd3bb8268f880b794181c25e33e74
154 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, many of which point to compromised WordPress sites hosting further PDF files, suggesting a link farm or redirection mechanism. One URL, 'https://infrive.ru/uplcv?utm_term=1000+free+real+instagram+followers+trial', appears to be a lure for free Instagram followers, a common phishing tactic. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6468

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://infrive.ru/uplcv?utm_term=1000+free+real+instagram+followers+trial PDF link annotation
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5438cc15---tevovuzefakevagobixup.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/sukarijugepenufawixebo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614094c1b544c---39866002371.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049a6578ef---ruwegezi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mupekuvezasilo.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/mavikibumikuw.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/vamoxigakad.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tomativaxobufuxuzuxekum.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b362cbd8---22631703769.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/tivelijeguwirik.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109041238259428.pdfIn PDF document text
    • http://altus.pl/userfiles/file/mavis.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/51886854340.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tunebiv.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/lalekitigivozuroxoxefusi.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/lujoputarifisevutozas.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/datubamekobalanix.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dujafelibuxexugodalove.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/92766271164.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/46729427199.pdfIn PDF document text
    • https://edgecs.com/documents/wagefavomamekasofoziwoz.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/5878355142.pdfIn PDF document text

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