Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26905fc24be72ec…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 06:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cff7f963aa3ae6cae9ef218434eb7300 SHA-1: 66bd485f9a2653464f0255865052669ea4bf50ef SHA-256: b26905fc24be72ecaa320c8dfe2886c8f4bf8f4a8ff282df32efebd95c60dd20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=english+file+upper+intermediate+workbook+pdf PDF link annotation
    • http://hosteleriayvending.com/ckfinder/userfiles/files/11094431776.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mj80n02i9gk6id01qd25257vis/xawutemukukevamexuwomi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bdfa766837bec5428f4521d352db68ba/60891515481.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/83524568015.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/53945693407.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/28003771997.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3lluffpsjblu1fb9dnp4cbl0es/51894086157.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mt5bc08300keth0s0j6dkrhhs/bumud.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/xuxuxiw.pdfIn PDF document text
    • https://teamcode.net/upload/files/25247013805.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/34904129499.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9514adaa40fffb4f9a7afb0b45904559/fazav.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xelozikofowuja.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/zuxovuwufubaxawuluzumesek.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d8016634---pamadilifemerufivolija.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/lixepuj.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e36c475e465114d1a17100cb5bbd4418/55145858757.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/kenevawepisex.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/463981466464f53a45f382f57cca1e6b/65256323441.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/90d381269435c1c6460314dca6447b7a/zugoperigedejefuxibuf.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/didav.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_off0000b836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB836 11348 bytes
SHA-256: fea7fe25c62ae2712bbe761aa1aaaded8b4aa3631a4525a418e2589606b2e363
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 16852 bytes
SHA-256: efd161f5709f5afdeae6aa9a070ce1b7018f88d0a5f77a9b72fad6a52fc5e261
font_02_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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