Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e4913a331c727a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 11:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07cf6e4802568b470f53bd9679c04716 SHA-1: ef3f3701fe0be7bb304abcc039adb3ce5ae4c950 SHA-256: 83e4913a331c727aad4a5e7b9f06c0c46998385fd8209dfa6ee6731afeca150d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=mac+pdf+editor+reddit PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f5a6df8e---rinazomajuf.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/5796699513.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/tixunaletuleranudegudeje.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/zolaverobufejakorukore.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/55530450402.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/vazizanotebinodux.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e209bd4328---xidigoxelepugo.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/rosigi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tifise.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/xefobimumurojujex.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/8ianqgiu573ks516jni4uj6io1/rutedojifejefozesob.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/um45f4pvd5unv0pplc22qvp1rj/zajijedajopejamixisa.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/33924687700.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/92329102406.pdfIn PDF document text
    • https://etimes.mn/uploads/files/relifetulenesoxo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c99dc60455e---noxevimag.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tewodujivuziwufemifegig.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/teder.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/41747414673.pdfIn PDF document text
    • http://beijingteye.com/upload/files/10517371795.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b2fc6be9---xuretosubabeg.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_off0000ba71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA71 16312 bytes
SHA-256: 5e4cc3c187ecfb413d8b42614e6021f9870eba5a6ffb21f91269c0a88c447110
font_01_sfnt_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 10288 bytes
SHA-256: fc2b9c896c12d9aa029dd1875ec7718b9d1f8c7e0234cd3e9505b62400465f70
font_02_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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