Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fef308a4d44b369…

MALICIOUS

PDF

63.8 KB Created: 2021-07-09 12:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a3120f12419b08e3c71cdbb484379ba SHA-1: e121e62a9544d0fd1415b504179e1e0ca7da3bcb SHA-256: 1fef308a4d44b369fd3e20115dedcd7256297766b5ca9211db9950e46c87728b
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests the PDF itself is the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

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://cec-intl.ru/app/webroot/files/file/75854773246.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/tovuxonokogotis.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af798ac607---42172514105.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/biwufaragunugigisu.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/nezigimewoviwunune.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9adfef8e4496bdcfb2c19a1f680c2db2/31130583923.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d51c1dffbd---xopunuvoboritekotasajen.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160838475a0cec---15968604205.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/66069087804.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/xatofefipirazejuvow.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5a9b2e66---pomejisukavux.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/64200545689.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2cded81e68c240599f059baedee33ed5/bukebilanixivo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/aa27b760f68ac7244ca3712bdcc23e66/25242683346.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/10946803505.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/84859645857.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-8/20210608210319981086.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/59615455284.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/37642872138.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4a24812a---varaf.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088586a3d89c---5246230686.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/pisum.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/44665857483.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/35782069095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=question+mark+symbol+meaningPDF 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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 10956 bytes
SHA-256: 2b85662a4356e610588ebf44cbee04fb430533c2c12e4d8c4aead9e0d9eb51d9

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