Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d77ff23e9b72744…

MALICIOUS

PDF

98.0 KB Created: 2021-09-03 08:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7846483cf89cc134436922091fc65314 SHA-1: e52a362d036f59398db39ed5a18f8c24b2fde421 SHA-256: 3d77ff23e9b7274441e07d550de625f4347c5479172f951406bad410b1e6dc58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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
  • 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://queure.ru/uplcv?utm_term=bahay+na+bato+floor+plan+pdf PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h20rjftq8215fjlhrkccd66l62/tesezukutudike.pdfIn PDF document text
    • https://mashura.co/userfiles/files/dotuxe.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/kubivexurodur.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ges32407uk86967jtj408hcus/lazusu.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/muvonizopapo.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/087f8624e74b45c1c54015bf0cbe1dee/binasexogodixisil.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/43345097311.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/nezisibetenapux.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/73b9d742ec7ed7fa1341020012b4584c/mamakeduvoxodisetutob.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58991324256.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1de4129a5---90776912974.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075539f3f5cb---xezerira.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210803_8EED056540F7BEC5.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607025542a7a9---sixodojavenaluv.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/gdoqe64bhmmvjp3v3mufcn4vnb/38373427446.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/relumigabodizadopiza.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/13403411100.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/2944062704.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e48e6aabc00---lakupabajipine.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/58563171634.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611df0899a305---65619357267.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pumozizesaxosigetegudezax.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/49199129702.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/21931492197.pdfIn PDF document text
    • 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_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 18596 bytes
SHA-256: b712bcfff03557ff2712421a719d9571b1fcb2119a41eddb706d3a864106675d
font_01_sfnt_off00014a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6E 10508 bytes
SHA-256: 760a653611c3691e1bca674a8881f1fcf30bda4e1914c81783d2704b6ec36025
font_02_sfnt_off00016218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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