Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e08acab2bbbde6a…

MALICIOUS

PDF

63.6 KB Created: 2021-09-14 13:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83f81949494879c0ce1ce935ef6e3482 SHA-1: ff51098766bc1e0a7bcf044e22bc18a5b635b360 SHA-256: 3e08acab2bbbde6ac5824e833ffbd33933285cdb570cf00b3b80b540221a8e57
154 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6381

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://digireg.se/upload/kufezi.pdf In PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210912_20D81631D6825A48.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e354ef21b---noxopurolumiduvuligu.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/47453838178.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/vifozexofaza.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f56f4ed2aa---xowugemodazifolepobor.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/46b949a2a002e961c79db5f75f1dcae4/tilegaleveb.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/kotonede.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/32135033350.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/60359034469.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/riwupeveretalemujagigob.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/rabexomenodogalazovova.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/74035712065.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/puvudifumazupepidixobu.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/16959621138.pdfIn PDF document text
    • https://csodamalom.hu/files/files/92946203093.pdfIn PDF document text
    • http://splogservice.ru/content/file/nijenoxepi.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/ropiruwexerevakupasadavax.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/fulukokurujarun.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/duzamawoduderenilab.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zowukuteloginapisuvux.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/veziviwetixo.pdfIn PDF document text
    • http://mp-journal.com/media/file/korubabuw.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bumizududumoxenofelal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=personal+hotspot+iphone+7+not+workingPDF link annotation

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