Malicious PDF — malware analysis report

Static analysis result for SHA-256 f867cf3435d43865…

MALICIOUS

PDF

65.4 KB Created: 2021-09-15 12:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd6607ab42ca49bf40a3f4b0046b5733 SHA-1: 35c879eb7dcc69e387436085396b1b96d0e3edce SHA-256: f867cf3435d4386503b6e98c7ca5e687456b847d31c6c452b81c563a71f58328
154 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially compromised websites, suggesting a link farm or SEO poisoning tactic. The presence of these links indicates an attempt to lure users to malicious content or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6093

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://kcntanduc.vn/img_duhoc/files/tewidosepiguwe.pdf In PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109100314575561.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322d3863161---39855846113.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/sidivozijopavodorumax.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/97236432845.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/vagawijowedukonivoziko.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kogojufimused.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/xujadebipen.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141133bbcc61---68813414059.pdfIn PDF document text
    • https://questyme.com/userfiles/file/57759141038.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/nigudojaguxek.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/teropubajinawegiruf.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045fd2ae46---jiropironodarugav.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/pedusifodadegon.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/74313523138.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e787b3e593da409628273e8a828178ce/321510780.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/6538159493.pdfIn PDF document text
    • https://o-dance.com/upload/files/51496555363.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/mofuw.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/suzupirawijapadijiros.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/27184662846.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/xavowimosese.pdfIn PDF document text
    • http://envigest.cz/upload/file/73808271856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+delete+android+studio+completelyPDF link annotation

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