Malicious PDF — malware analysis report

Static analysis result for SHA-256 14de5fa74b53c7eb…

MALICIOUS

PDF

64.2 KB Created: 2021-08-24 07:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5814bdfa2221deafc6b4af1fc988e14f SHA-1: 98202c4a808fe947d6715d455641e9f977db4c97 SHA-256: 14de5fa74b53c7eb7aae7256c641862364a83ca3fdeedefab0a94b2045fe7a3f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9467

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://greenplanetnepal.com/userfiles/file/wuwazeduvefozogog.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/lixuki.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/90126745132.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/91984981678.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gukifigeti.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gpoq70iho68r98tqv1upto4j1t/19114229323.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/serirom.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/62097230323.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/wumefawadijodetelupipovuv.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ed90d1b8fa7290c648d0680dfa7aa9cb/zadixiz.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/gazamaginexegemu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tusovojujulupamigadovu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099944fdc303---97694925877.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/27420872371.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/85347412580.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/99692731706.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/mobagutemukalili.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/63216222429.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/17654049652.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f9a7495d---54342043419.pdfIn PDF document text
    • https://stopserv.ru/files/file/5528293089.pdfIn PDF document text
    • http://plncse.hu/php_data/file/piwefewogugudovejunir.pdfIn PDF document text
    • https://istanajp2.com/contents//files/jotijifuzodivofanu.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/nasegowuzuga.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/43bcc73fe08bc847fa9035311ad5233b/dewup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2012+dyna+wide+glide+for+salePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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