Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f949e24293d97bd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 08:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 847958a491bea12bb9d89ae320374469 SHA-1: 711d47403a918636445b633e3cf4045c080afd26 SHA-256: 8f949e24293d97bda5dd0f032230e8ed8aceddd77c742b0e803dd3e0497e8c19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/zuvobekusefapibixidera.pdf In PDF document text
    • http://maxidmum.com/images/upload/fck/file/47088177246.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sinudowex.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/97190038123.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/94898133814.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/nateparagisikewozuxi.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/xemafegagikeruparew.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d66c81f36b---56346788293.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/13564992254.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/85244952974.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/boreludipojojimakub.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/41527055262.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/9428573361.pdfIn PDF document text
    • http://aven.su/userfiles/file/2924199099.pdfIn PDF document text
    • http://scpt.it/userfiles/files/20757909337.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/tajilojopubenasusog.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/wuturoduxelakemakunogigo.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/100552072161318c69d719f.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/21124678595.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5dba6f9bd950a2f9f976a536da5f6c2d/bileposez.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/43041340119.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e999740b8---modidode.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135448b531c2---kopukufupisox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=present+simple+and+present+continuous+text+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_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 18552 bytes
SHA-256: 1b562b5247348e273b4017285ce7ebdaae082824dda7bce2aa72f4dd1f0e8755
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 10984 bytes
SHA-256: 1637e9d42ee3497f0332ae09ad73c46a501013dbe9b9351edbe9b1d6f2188c27

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