Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67c5a5d7cca4170…

MALICIOUS

PDF

51.2 KB Created: 2021-09-22 11:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eebb65238328ea12ef6813c241cc086c SHA-1: 5c73a4141826347334d735ee3b36c0800120a461 SHA-256: b67c5a5d7cca4170d905c5659acd262758913ef5f50c4cb5f30b247c46afbf17
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it may leverage PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5572

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://crewmak.ru/uplcv?utm_term=advanced+learner+oxford+dictionary+pdf PDF link annotation
    • https://matharu.ae/userfiles/file/25291894462.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/94439814049.pdfIn PDF document text
    • http://imbirimbir.ru/files/17407481183.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210906_20_59_43.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/74266143366.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/wiwubekedobatoladusum.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614259c896c7e---54045621124.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/11401587025.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/zilemejonoxekojetaju.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/70594144388.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/kezozeri.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109090728355269.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613425e0b6dfb---74929701463.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/penawonixijupatirezo.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61750647660.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/fotibawivofakalabifijab.pdfIn PDF document text
    • http://vina2002.com/uploads/files/99539607761.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912202540627952.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381c63b2205---xuguxovirazife.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/42357186818.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/436a83736a89fd6558647fff558ff498/57311957269.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/881593604.pdfIn PDF document text

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