Malicious PDF — malware analysis report

Static analysis result for SHA-256 86474177fef0dfa7…

MALICIOUS

PDF

56.2 KB Created: 2021-09-19 23:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05922a7a4ba5e02863af9c54e9a89541 SHA-1: 1d25810014fe96e84e2867e3dc758f9cfa177b79 SHA-256: 86474177fef0dfa7d532ca939359de2aa8c3d109a3bceb8a2f10ee18e9aff179
154 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to obscure the ultimate destination. The presence of multiple PDF link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7219

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hefcom-hydraulics.com/ckfinder/userfiles/files/samupotopo.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a33721d69772a1e63488ff877a9a3e75/lulukezup.pdf
    • https://kueapem.com/contents/files/vajirojod.pdf
    • https://luckyfood.itweald.com/uploads/files/6141ffde4dc1d.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6415607ffd3ca806bebaad59bd5e6373/67828315309.pdf
    • http://autosvilar.com/uploads/ckfinder/files/87341005046.pdf
    • http://www.kotolantopeni.cz/files/nibozumuno.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c480109248---72044443724.pdf
    • http://tai-group.com/upload/files/94494575663.pdf
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/vajenilato.pdf
    • http://patriabrno.cz/userfiles/files/37708929271.pdf
    • http://acrclubinversores.com/files/galeria/files/88998918828.pdf
    • http://arredamentoambienti.it/img/file/85786634024.pdf
    • https://magnettoptan.com/upload/ckfinder/files/julenakekekox.pdf
    • http://www.armstrongre.com/files/files/rededu.pdf
    • http://computer-rudolstadt.de/upload/file/2254106383.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161442b13edf00---figugigu.pdf
    • https://webmakler.org/userfiles/file/55124845328.pdf
    • http://goang-hann.com/uploads/files/202109061835315334.pdf
    • http://fine-trading-knotwork.com/uploads/media/16914670592.pdf
    • https://salondumariagededijon.com/userfiles/file/41057366782.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/32853214882.pdf
    • https://inprovitbolivia.com/ckfinder/userfiles/files/26467858289.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021091608501373499.pdf
    • http://munnarinfo.in/userfiles/file/xopamu.pdf
    • https://atputasbazes.lv/images/userfiles/files/fefawazutanasemedasigujex.pdf
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/xatovadimubifedi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=windows+7+rom+for+android

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