Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f93b2becc456b2…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 23:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e7803d144ce8ac5468c263f3f9022df SHA-1: 54f59fea73bb9a52cbca0709ae7ff1cbd55d1aec SHA-256: 03f93b2becc456b248f9debb38ad78cec7e71cb0e4147aff39880e5b3c4b984f
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous links to potentially compromised websites, suggesting an attempt to trick users into downloading malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e2697157d22315cd05a753968f664895/bugemotan.pdf
    • http://www.tomasjelinek.com/img/pub/file/97668336889.pdf
    • https://deltagroup.bg/uploads/file/46704593651.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/91563719040.pdf
    • http://sharon-barron.com/userfiles/files/44008150966.pdf
    • http://jikaramen.com/uploads/files/95391754604.pdf
    • http://atut-biuro.com/uploaded/file/kuvok.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b66ac7b243eba297320dadbc979a4893/98740955666.pdf
    • https://nffcd.org/userfiles/files/lemunuvevuxivujenamupi.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832a816eba8---61943230472.pdf
    • http://asustainable.com/global/file/movazupebu.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/3168168059.pdf
    • https://jahanchart.ir/data/files/file/48423629995.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/00de128d9e3f3bae6455ea273f733a21/naxotexosutesopawu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983922db56c---sopopilu.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607deca5a658b---lisovuvajuxaw.pdf
    • http://sincaremedicaltour.com/js/upload/41936944251.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f817cd7cd3---fotunevonifodafofa.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad016b4514---damofupafekitagex.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080147b4af00---goxawagedeker.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/4219250cc81a18fbbef39cf3ff5c73a5/82194529764.pdf
    • http://huile-de-nigelle.info/userfiles/file/wofiros.pdf
    • http://dianacb.cz/userfiles/file/dipotinamibatom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fundamentals+of+electric+circuits+5th+edition+practice+problem+solutions
    • http://highered.mheducation.com/
    • 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_off0000e995.bin
386e419c2d9af3818e818a9a0c03883ab1b7ac9e95a91966859d3caab9253699
pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 18788 bytes
font_01_sfnt_off00011bad.bin
27361a7bfafe3c1531a3ac309655031d712cd6b72b6ce0214c47a070f78425a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 11236 bytes
font_02_sfnt_off00013599.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 16792 bytes