Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c93ec3de7ca632…

MALICIOUS

PDF

84.2 KB Created: 2021-08-18 16:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 709ebbd0caf5c562e2babd69dc53e5db SHA-1: 2f5cfb763c9b1027452b38eb7f7f073309094526 SHA-256: 72c93ec3de7ca632431013f6fb1ec1d556dec895fcdc773aea6977c26f831b67
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and link farm characteristics points towards an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ed8de120---xovadifonubeva.pdf In PDF document text
    • http://myshopgroup.com/userfiles/files/xeribopanoniz.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/rozojunaru.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/34628544043ea52652a3edc5d176ad07/lowoze.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/36366761726.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7b1bd8f3146eba792d6a2fdaa277416c/fipov.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/sokok.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6802795c64bec2ad06308f4c4de84936/lipasezoniloposuj.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074adf945590---72808769222.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/7ffc5ffed321e8f4bc410e4b48709dc5/sidomitapenojiruda.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/xukasorubo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8fec685a---pipoti.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/5u87bth7tqgh0ioa5epg7a6m67/gunip.pdfIn PDF document text
    • http://metabolit.ru/files/file/51813123488.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/naxavilubepuve.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/30502583726.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/josedopit.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608add7ad4176---40843423468.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/43547611754.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e575d071aa---nefitawujibi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608030d0b743d---paritizurojokeretudak.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/telaragozurufikus.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8941d30c9---dasizotitovebekibarawepug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=among+us+hack+mod+menu+pc+always+imposter+mobilePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 11472 bytes
SHA-256: 27eaf1c170ed749e8d2bfb83c4e87a0e0df474a5e399f09d1f436c77fa93035f
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 16332 bytes
SHA-256: 6c24444373bb265cf094d5a214d631c8d0986eab391285d029512e2f04f5788f
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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