Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f875faf66293a33…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 01:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bc0291e884fb1012f4777b679fb2625 SHA-1: c70112d8208f826237e54b4b589865000c4efea7 SHA-256: 3f875faf66293a33c0ef65084336d88aa94a00c53be31bd247b1b46efad3d097
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://spy-military-labs.com/userfiles/file/45590386882.pdf In PDF document text
    • http://area100impianti.it/userfiles/files/47538312900.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e403b21deb---38477673356.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/48260865846.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/46920917585.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/volowujezumagedurob.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/6312556499.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/83e9bcd9aff2d861f828272c46d47fef/guwapimufumosudetifupuli.pdfIn PDF document text
    • http://suaups.net/userfiles/file/19587427370.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/1268946662.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1f6fe5b02fc5e8836e2df21b29f5514f/xevoxodopiliguj.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/53185272185.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/pifowopev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613482171cc2c---46398142314.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/gemeb.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/72927030676.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/7663005888.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/lojojavix.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/52345760220.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/68135548935.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-5/20210905000951741864.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/rodetaf.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6sukeicvpi6aefep49fbm2fp7j/fudixizamudaxugesiwo.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/lupokotiniganuzawetokapi.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/20302260692.pdfIn PDF document text
    • https://pokereshop.cz/data/file/92912339573.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/tixefinutovusixovodufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=happymod+online+downloadPDF 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_off0000b41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2E 16660 bytes
SHA-256: bff7ebe9f9d78a18442b5b9d512bde2bd8ca14007148285f673893a25f5384cc
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10380 bytes
SHA-256: d0b60e78a2c53f3b124e5ac4a8d98449b63bd7d35743c560e69f9fcc90e0063a