Malicious PDF — malware analysis report

Static analysis result for SHA-256 84db97891c8bd92e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 06:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b5b1e825d7ae1e992225af92c8faf86f SHA-1: 19b3aeea27804bc23bd62bf0ed2c071a57425aa5 SHA-256: 84db97891c8bd92e8bef1ecc55bfc6502ec5bd149693a85cd31a08280b9738f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://texmet.pl/userimages/file/4097293909.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fed54b73---358712848.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613f2549af7bf---tagubokugej.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/zafeke.pdfIn PDF document text
    • http://vitrine-prof.com/files/gonivivoduvu.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/dodemedexugejew.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/49306057693.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/takobudupate.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3d378516c50e1302f0537a7ef7f53fc1/jisitun.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/95633026680.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/tofuvapafifaler.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/90748828555.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/tezibilajugukofuguzijag.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/likutulabazafepusojosas.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614217b9bdf6e---87566411742.pdfIn PDF document text
    • http://gro-felix.si/uploads/fevusojuzejowipijof.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/11633293639.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/75900918436.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/mosurakulidewi.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/podulazufagozijoxotan.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/23780806516.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9aca768d8109d93ea1e665363d3eb0ac/22275023697.pdfIn PDF document text
    • http://health-bridge.in/upload/file/12288124337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=elementary+principles+of+chemical+processes+3rd+edition+solutions+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_off0000c106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC106 16732 bytes
SHA-256: 90c0daf4ae796033e167553fa8cc683144353e991adf7fbfdb6a25c649a17eaf
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 11252 bytes
SHA-256: 9c8c39f6a2672ade0f6b8d31a293177b2693c0b96d96334e6feb966c6ea6d847
font_02_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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