Malicious PDF — malware analysis report

Static analysis result for SHA-256 20be8c2ff5e480ac…

MALICIOUS

PDF

62.5 KB Created: 2021-09-17 17:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef0864672cad6dcaeec4d8a8917099fe SHA-1: 201ae275c91298cccb0e50b8d2500889259310d3 SHA-256: 20be8c2ff5e480ac839dc114b3c0f150569659fe955a0903ffa53d1ef4cb4df8
154 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7797

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://agriturismolescuderie.eu/userfiles/files/93610139534.pdf
    • http://icbiz.ru/userfiles/file/84348438564.pdf
    • https://satellietgroep.nl/userfiles/files/43663833738.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7432ed016659129018a37b528b18a93c/75139673375.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6835cb2a177a64d61136a094f102b4de/zefaguvigu.pdf
    • http://upnbkk.com/file_media/file_image/file/62379082003.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfa8930a4---gepofubikuzinekexevodiso.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161364b167ab2e---rixodikixaforotowu.pdf
    • http://anquocrealty.com/uploads/image/files/12320716850.pdf
    • http://abacusnancy.com/userfiles/file/wiparamodis.pdf
    • http://congseng.com/uploadfile/files/zufadojatovor.pdf
    • https://muzpony.de/obrazki/file/23858128035.pdf
    • http://bachtungcompany.com/upload/files/bikotugaji.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613663a30975e---77126888369.pdf
    • https://petribax.nl/userfiles/file/22822914671.pdf
    • http://eva.am/files/a489deba9f9d9e54.pdf
    • http://baobianhkhang.com/upload/files/63714592596.pdf
    • https://pharma-tools.pl/galeria/file/wutijobudogabo.pdf
    • http://agriturismolionsfarm.it/userfiles/files/19498924880.pdf
    • http://caytrong.vn/Images_upload/files/32656813755.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/wubutotumafedomefopeni.pdf
    • http://youil.org/userData/board/file/68482076024.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/85072418426.pdf
    • https://calprin.com/ckfinder/userfiles/files/jewegidob.pdf
    • http://3xlove.com/uploadfile/file/8609752092.pdf
    • http://royalwedding.jp/images/blog/file/21004499227.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ded409c---vudemafifafozel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hang+em+high+full+movie+123movies

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