Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6377aeca4e69b5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 23:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52f676f14c9103a83dac88d9fbd2baed SHA-1: 911538eedd4714a52f4c75b54d834fbfd552197a SHA-256: 7a6377aeca4e69b59e86c70c9c2277b80bb15de887dfe4eaa750f15dbd42c944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links and the overall heuristic profile strongly suggest an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098a29bcf6---34367118519.pdf In PDF document text
    • https://vzglavniki.net/data/file/35631638394.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/55976898092.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/12326996438.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/93265455840.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f6129ea71abd8c33911540bcb24e49fb/suriwivekikomazem.pdfIn PDF document text
    • https://parc-hotel.info/file/rimirisuduveremeve.pdfIn PDF document text
    • http://apsons.eu/files/file/82895181278.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4d7904e6a94e4bd63f3aa3113f44904e/86331311391.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/visojejuje.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/91449076071.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/fagaxekebopovotub.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608728e7e4151---rogobuvopus.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9brg5oet0vre6ou278389rbr2b/narofenazovumimevakazuga.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b773e19fb---rawul.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/56043809145.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/81024969341.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/25611283664.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mefitezigujolajelilavija.pdfIn PDF document text
    • https://digireg.at/upload/pokewaxoxutis.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9d608bbf---nuxunebogiwogabanofofav.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8d15f319d3105c16edd0aaa8a513ec40/13163337189.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/a39b573f741e43b1f689d9bbec7db482/rokedi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/baa109c107fe5aa556b1df3f9b79095d/zazibeved.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/59960255729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=past+tenses+practice+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_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 10448 bytes
SHA-256: 0d5132283913bd1b876d9496ddd61917a2813d511a624da054d38647c0100834
font_01_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 17044 bytes
SHA-256: 020f9a761407422d8cd3613ba0804953b2189b0060ca413dc4b0298e5c1062b1
font_02_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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