Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce27124a063fea…

MALICIOUS

PDF

84.0 KB Created: 2021-08-30 17:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da22792e61afc6b1d69f74b995e35f22 SHA-1: 9d7046e377168a885bab1348fdd292fb4f031ebb SHA-256: 66ce27124a063fea7d31bb119b9e421eb75ecb2542253a59ece0fbaf2abab087
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=quotes+for+your+crush+not+liking+you PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/409208db9c07d2147440ddc456bacd23/9489461192.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/gs0cr992jcsis0t5e6d895qkg7/14385076201.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/10331525965.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/bakalotujazupupomipuje.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceca21976---23796726692.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fopugukug.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/27891391868.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/66875971044.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/60977360332.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba611b61d---vazofezukugugopapogajuma.pdfIn PDF document text
    • https://majubesar.org/contents/files/38670778491.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/50956792671.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/38203353737.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/xajilosutefi.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/4078903413.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08167d1a4---57246573091.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/25848736840.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/54022340224.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50e4908fa---40470345276.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8126e708---96150004719.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/barugiwuzit.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/32619063339.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f72da01e---42942004416.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_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 10820 bytes
SHA-256: 059333b350ea64a05fbfdcb54dd6429c234562e6b4d3f9921c12256babc5be34
font_01_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 18144 bytes
SHA-256: 5857daa0d401da1a34259068075f57ebc49b7bb9671ac0bdb713b71dc0c14288
font_02_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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