Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed92f39582d231e…

MALICIOUS

PDF

69.2 KB Created: 2021-05-26 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30d3ae2de5e8365466210463cbea6a03 SHA-1: 5b66789f20fe15c97dfb50a257bd9a67d59f5444 SHA-256: 2ed92f39582d231ed20f6480603f6dfe9567247fdec4eb507bef55ce94d34ab3
156 Risk Score

Malware Insights

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

The PDF contains a lure for a Windows 8.1 Pro serial key, which is a common phishing tactic. It also hosts multiple links to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c05dfbbe---pogafoxi.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d5f2cabc---gelijupekuvazeduzik.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/78994b0efc76844ed11762bf53c9343d/wovapobowe.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1d2a4fd1b---75774161907.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160720efb6688e---vovetawilijepo.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1htsb80l75lggvu4ppb6d5707a/wenobusulamixaz.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f84c95a7---4701447336.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/furuke.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e27f55fd1e---80273436709.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f97dc7ed9---lelis.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a3775bd---46182914130.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h2jtcrqg4991htvkdbrqu65ime/46544860108.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a993ce64ae8---vizunedojoluxov.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c7bkq4t55f9ha1tla7nue4e6b2/87875617873.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=serial+windows+8.1+pro+32+bits+2019
    • 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_off0000cea0.bin
786dd2aca591ce52db0a1696f481f9f44879184c67581859dd7fa8c69da00590		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 6160 bytes
font_01_sfnt_off0000e3a1.bin
3cae3131d8fa310bbfa491670648a7f1c99cf05ed753495bd68c619d9cb8b035		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 10560 bytes

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