Malicious PDF — malware analysis report

Static analysis result for SHA-256 26705b2f2cb5ff18…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 14:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 566cd1606556c580da08c7d108a89d60 SHA-1: 172dde5ab406d7a42deb58e127f0d2a5072af971 SHA-256: 26705b2f2cb5ff1869d5fdaa640884af538fa87eb5b40a6bf20bf8a854c77d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://sns.hu/_user/file/jazakutadofusu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a23916d5c45fad9e817524cac1c482a7/57824289531.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/21e282d7ccfab9f3f1932d7ae84cff43/86154329733.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c3aa162465a52fca9c3231d721bd084f/jituliwubuxebiwisa.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/90028642975.pdf
    • http://extracam.es/app/webroot/arxius/file/4569571265.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1d809b8b5d2313cabf5e388b92bda788/19353530356.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077a64fc8b8f---pepizewub.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160757c51374cb---sudonibilisubomuxeruwusi.pdf
    • http://vipnjl.com/userfiles/files/92992659606.pdf
    • https://longhoang.vn/upload/files/jumitibisefitoperes.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7ed738bb0f7ab762a81ba59426fd5326/66002707727.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f282784c8c---59876268692.pdf
    • http://astorandblack.net/emailer/userfiles/file/94750941648.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cd97b5e3740---garotozuwi.pdf
    • http://parfumkin.ru/files/files/pikere.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/melofaputuregoromajegiwuz.pdf
    • http://sk-uralstroy.ru/uploads/files/kusafososule.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d51d7a5ee---movebunulixepepipines.pdf
    • https://csodamalom.hu/files/files/vubekeresitug.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1986c09e78fe6d9503677ea4e50e07a3/90718892802.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/mufenevipawedusilexupika.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0dl3cf348h3a1vors238oesd15/6547938465.pdf
    • http://summithigh75.com/clients/867147/File/vopexomujuvodozo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=microcontroladores+pic+%E2%80%93+programaci%C3%B3n+en+c+con+ejemplos+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d903.bin
8ab3b984af1aa42e20a28e818b6f9d3a6d56ce7e5bd5f1183742b1724feb22c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 11256 bytes
font_01_sfnt_off0000f2f1.bin
df08f48550f2b2e5c829eebb738369e047ca855c2209a91a54372db3ccf47a51
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 18932 bytes
font_02_sfnt_off000123cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 16792 bytes