Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd3c00c2cf6f801…

MALICIOUS

PDF

67.9 KB Created: 2021-08-09 06:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ff7a3be13c6b55db56ea35f17a15aae SHA-1: 73ce3babb48f1c80b7677e7fc8eafabc4aa6daa6 SHA-256: 4cd3c00c2cf6f8016ec2beccfb6436a9485b98a51d13fdd8af95645aaa815d05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8877

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://dragonera.cn/admin/userfiles/file/82785342332.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/77379114034.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3bd7d5c52---rutisugenutevisirag.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/40511974055.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b769cb32aca---94927700911.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590a94bf09---waxapexumexasedizeretuxu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28cb1ddf8---52499192688.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/kivub.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9a292f0a0c1f88c3ed38392a60c82e67/40912158274.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e115d8119---66961247888.pdfIn PDF document text
    • https://dintek.eu/uploads/file/lojuvemaje.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/88446401808.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160843db9b376a---wigite.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/66285704494.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c099181a27---sekejitoz.pdfIn PDF document text
    • https://bauarch.bg/files/rufet.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/22840451369.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556f49e53e---72522102641.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/jukeji.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7abq2d9b35bq8555460ppt2b1e/rarad.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/fukexudagoralo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d12f9adb08---vipuzonubegamowime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=is+rv+parky+freePDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/vadewurawufabepamozowanol.pdfIn PDF document text

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