Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6a4e6901d2dbbf…

MALICIOUS

PDF

47.6 KB Created: 2021-09-20 09:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e531e2c22cb543fde21bb044a84de924 SHA-1: b899a6bd4664cb6e80f3e4834cd9d153f92a546f SHA-256: ca6a4e6901d2dbbfdf6235ce29d349a1cfd9cdf391c49a330fc736398957ca0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further support this, identifying the use of disposable hosting and compromised CMS uploads for hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6441

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://www.tractortools.cz/ckfinder/userfiles/files/54882829905.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9cab4845---20884149027.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/4959288d570615d79cc0c5df8e90cd72.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ae796948---40255776323.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/rimitoto.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/tuzovusugotaxadexafizirov.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nigesoguvesaziju.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wajizenijujonufib.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1287f7d7---lonuzuji.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/vagefeva.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/wukusedum.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/7292314608.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/92375216095.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/70649279533.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161462c4996957---83394753661.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/kojaf.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/20107682460.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907224512.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/56181477627.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/fipejisebezoj.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/pemetijokedifotikotado.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/56454509420.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/vebuduwepi.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/mijin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=names+of+equipment+in+a+science+labPDF link annotation

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