Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b96a2ed0125a22…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 21:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f9325238aa994cf8a5344373d25cd3d SHA-1: 129c1352a260eb4e6fd2b2efa9198a42995f02da SHA-256: 24b96a2ed0125a22338b15d35bbd95a7591a35d1dd720c93426003b718d0e0db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather for programmatic exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://avsa.org/sites/default/files/images/files/72070518411.pdf In PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosafedupivedikatuku.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/55328940948.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc7d41b930---tatixusewo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c574ecd3---63478427532.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086456b4a85b---vezonujijonuxoz.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fba692e0d17566a16c0c38bf7055a68d/mipofujiwuradu.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/maxowanojesuzoxet.pdfIn PDF document text
    • http://wenxuezj.com/images/File/besegujuwudorusiluwekiwo.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210716_08AC7AE186B01FB6.pdfIn PDF document text
    • http://njnccualumni.com/clients/0/05/05b55d2c4c342460da0dc2f503861b12/File/87990540398.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/gilupinedawetizulasafuv.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/91579147273.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/pefuge.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/27204761623.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0ad8ad61ef68e15efe2d2cf1b4c4e165/golig.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/42932746243.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/nopixomogokeked.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tunowofevitikiwigexi.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/58227098315.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/bsm2cau02b8270bc6ud9gae0b2/24055630115.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/55844164080.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16116b9292d44e---65229570241.pdfIn PDF document text
    • https://dm288.com/slicice/file/dabawox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rarotonga+map+pdfPDF 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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 19456 bytes
SHA-256: db82ea005b790eeda0082d165e5a7e09cf5d906f75b8d106c28bca691636a9b1
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 10448 bytes
SHA-256: 2f3ee8bb3274d5ecc3fbe1b5a3f771460ddd517efe3122a08d1471d35dca29f8
font_02_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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