Malicious PDF — malware analysis report

Static analysis result for SHA-256 503b675818ca5b3b…

MALICIOUS

PDF

87.5 KB Created: 2021-07-13 04:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 148de75fb24bbf85f35e504d2096c288 SHA-1: fc5b5ae50928ed8601a22146854906ac958b3931 SHA-256: 503b675818ca5b3bfeda0578cda87fe3aa8bb5cd9911305bb0f201074de6cf0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/dcg4ums3uqllu3amgh4070t9v4/94679811744.pdf In PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/32abebcd6caa8e98970e947e948eb080/53280251255.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072429927a7e---neximofujekesesa.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/55706891875.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/283d02eec2de171d0f931ba49a0bce28/zenitazoxeguvekepelo.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/20239483288.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec28be660---63564960906.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81970707f8---balamebodajiso.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6484a5177---tafoxenalag.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/cj16v43fttpkbpnfqlid6lf134/82752141228.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255f2dec68---dosovodox.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5c812kr484qrsnqa23fmsg3ks3/dulapesa.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/raxuxokepulufazuvunagevu.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/23396591421.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bf439b3dafa64976d58b1f827d9cede8/wenazunijifadov.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/43484947315.pdfIn PDF document text
    • http://sun-eko.eu/files/file/51745305128.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/20105549897.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/11bce1d24c0933960e543314b5a9c448/88411771106.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/4748544802.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bdd4bc303de9d4ebeadac0139fe2808b/52584916157.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/45cee6f3b9208f0c181ba3703fab4142/melupatejakafa.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/6760163780.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/60ifdsva91k7pufdnttth0pmiv/zufidogadu.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/48035320184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=online+cad+file+converter+to+lower+versionPDF 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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 17468 bytes
SHA-256: 8a890f1a3fd6742f9952a9a11cc94f12dc5f72a970e689ab9cc74a9fe5315d73
font_01_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 10644 bytes
SHA-256: 9d78319f5c1628dca8f1260cb6fcb29a62a50c24bac907e848fbb3570dfae02d