Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9269764e2917af…

MALICIOUS

PDF

69.3 KB Created: 2021-06-24 23:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6455696a5f3dc97e77b6317d5b47654b SHA-1: 496aaeda62b3ce7fdfe0ccf3cb9b7e7d4c5a1401 SHA-256: ab9269764e2917af50841000eab96cc754cc881213ab89252789b52d41c11330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to lure victims into downloading further malware or divulging sensitive information. The presence of external URI heuristics and link farm detections strongly suggests a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=10th+class+cbse+textbook+pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b546d640301---79033484057.pdf
    • http://kimhoatra.com/upload/fckimagesfile/50878983773.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b93fe46ed---zunonisegudajidixev.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17874aca5---29444741109.pdf
    • https://a2designbg.com/userfiles/file/87044062193.pdf
    • http://studioassociatoemc.com/userfiles/files/nejazevo.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf0dc2f9b---bewuwexijagip.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf425375b---nokozozafaxidizufufusuza.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb6271064---66209842316.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/vipezugurimag.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eshighvk71kghucp7gj4phqo72/62899015721.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608597150e51b---jumirujiwubejejulope.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c71d46d3195e140efe0343439e947c82/23098589676.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989bd09b881---91396943772.pdf
    • https://pendekaremas.com/contents//files/gazovipixelukaz.pdf
    • https://marmarases.com/upload/ckfinder/files/vuzaxebupebi.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/83963bd62dbe1a5f55642d60ff0a78ff/vasivuvodiled.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf19.bin
66c832f6058b1875126f9deda991819cf6402e131e5fe4e297ebb4c68fd4c061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 5520 bytes
font_01_sfnt_off0000e1da.bin
0da1ab593a7deb9248489fc32414ec4da641cf52e07d8dea1cc1960c588a97cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 11288 bytes

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