Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aac6b661e54d34…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 07:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4fd2a57bb0f8fa9db3adf5afaf869ef SHA-1: 11ec65a0f67abd2855ccecaaef4bded9a6e8de42 SHA-256: d8aac6b661e54d34ee8e61df931cbaa69844f2147e9c56fc4fa8b5e012090e81
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing lures. The 'SE_MFA_LURE' heuristic indicates the document's purpose is to harvest credentials by impersonating MFA or one-time code requests. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign designed to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4124552cc75a0aee83e9dc7ef7de67e9/xunexixadipevotub.pdf In PDF document text
    • http://itena.si/uporabnik/file/15786329100.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c4fd7b168---wekozusegoj.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/2b571b3c3a9118ae893eefbeff121815/18236297603.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/q0aj5jv8h3hgi738fqcv09mf5f/losidira.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/mawoxupuxesenomel.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/47315870528.pdfIn PDF document text
    • https://castel.ro/userfiles/file/85789145944.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e29035ff2717bfa91a517edc251d937c/falupowurojaxamexababaleg.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gll45gkh17tcjlu3l6khr2pjo5/75907356643.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gekakagiwibib.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e1d0252b7bfd39b8c05f57600e41ae58/6990345857.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e243c685c7---91302386235.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16110e1256882b---tulijo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c29be0c1e41d8215b79f7a811196c509/97318868767.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/124o2jgbktv17ko4aqsec8li9o/76030205512.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/80691602088.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/980f96f88b2c6f73e552b58c8a2413a7/82640233088.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/mitikuwitedojine.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/70273916308.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/bedasepogejatukas.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/3lq2fvgs24b9h11kvga82vvsu6/72288379658.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/xerokovomesewejibaxok.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/65195479262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+send+a+voicemail+without+calling+someonePDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 17752 bytes
SHA-256: 0c2e719e06b3069982ac42b0a63882a0137929007f3f7b97e5228cf10dcee3f1
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 10960 bytes
SHA-256: c2b514600c7f584e1300659c2e6b160ee573145e413123b8a13606ea3601c46e

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