Malicious PDF — malware analysis report

Static analysis result for SHA-256 f417c5e3abaa4f82…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 15:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f6f66f5793d24f226ee45123ee96c98 SHA-1: b55f4ac533e5f2efebb5491dda49efac8e235fb3 SHA-256: f417c5e3abaa4f82967dedda13fd99103b674b6f72884e548fe5b68afaf13fbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to various domains, many of which appear to be part of a link farm hosted on compromised or disposable infrastructure. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing campaigns. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=magnetism+worksheets+for+5th+grade PDF link annotation
    • http://esoftland.com/userfiles/file/63960871620.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/33425197666.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f6c9ddf02---42221749033.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/tukubozunexupokutojaf.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f8b96e5b---96820073335.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86845245142.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/73db363057ef7581c5e1fbc9edd7f7a1/78980341240.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/14799617901.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1310eb295---vurepijejas.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/18624611193.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/66135948303.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/908d6bbf0e0c1d34b93211df0e0ed6f9/bitotumefibegolukerepozo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0ded29b51640feb63b3a53642fb1aa4c/46807557026.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2da9dba9a7---4717982810.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/12bea302744484393a310600b3fa7f98/fifamiziporagukegoxom.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/bcde51ec113ab3605e09a0c51fc0867d/bubokumijujoxoxizaxalop.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/38344976577.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eca0e20e5---22133248513.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/xuwarodefixifowaludu.pdfIn PDF document text
    • http://marine-inox.com/i/File/boloz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sq00pn9gopt8a1qgo47acsup0k/sarow.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_off0000c1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 11060 bytes
SHA-256: fb071340ac57162c0a3eb86bdb7a24b77a7be11ff3a73b5b2f67862764c9b853
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 17020 bytes
SHA-256: 2478539dc602aa389e79e3efc58d653de75b0b256bf6f166dc79823895145a77

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