Malicious PDF — malware analysis report

Static analysis result for SHA-256 9662b10736c5f315…

MALICIOUS

PDF

60.9 KB Created: 2021-09-08 03:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 954b2f1f175b2fe154989d6ed475edce SHA-1: 360435b8b3b902b1422329574864e43cdd56e2d1 SHA-256: 9662b10736c5f3153a444b40a986020634aef1ebe1b9b1a2296b5b65bbe64559
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress uploads or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5565

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://branchennachweis.eu/userfiles/file/54252568634.pdf In PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/danejaxisit.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/sitak.pdfIn PDF document text
    • http://ezibra.pl/upload//file/89344538069.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/11320835174.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab88e58a4---98796076487.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52c13851---96110313917.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/74587887730.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qsp2s6sq259dr7nsc5gq971jt3/30196949683.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3cd5704e---1175318225.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c0d3130d---38334464520.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fba9ced4d233f8f5b230b9f016ccd470/vobuvojefokovolubew.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rukukez.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fcb0f47f3b97ad7620a63e19d724bbfc/60321991564.pdfIn PDF document text
    • https://hssanesteban.cl/files/dedinitepopisilomalizure.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nividotuzujewiporu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0118f0798---difirupunubulelep.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/golewetuvusulelufo.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/31334093442.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/61605287568.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ddff02791fb---mizunisamajixaramagaw.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/fumam.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e78f689e703e9d5c6a5b027354b3a94e/65795794381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=enfermedades+cardiovasculares+en+chile+pdfPDF link annotation

Related samples 8

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