Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a9618e3dbf913c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-14 16:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e4aed55812d77d461459fd251d762a2 SHA-1: f3f23cd570cefa6ce43eb1f0b2734748222002be SHA-256: 68a9618e3dbf913c0169b7fdd91fac8167b74f85bc24398a0a2a3fc4c760f3a5
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick the user into installing a browser extension or update. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gorod-r.com/userfiles/file/32725143649.pdf In PDF document text
    • https://faresaldabbous.com/uploads/file/nuboxoxajuxumizabulebaj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134afb38eed2---34968528251.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/95146874288.pdfIn PDF document text
    • https://ksboutlet.com/file/files/99900124314.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab59581cc---foguposujezi.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/gugesometitoripaf.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8dd3ccc45---dagojediwawopu.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/xafetove.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/bewugetupanakujedafuzinob.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/gedipazonupalepedanasalas.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9ce0f4a81c25fcfb70df1785179c38ff/15373958163.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/pepegarumevewag.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d7efd91a89f148bbb54c22c05473a551/zepedomeziresegetepa.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/wikanunad.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/25511668328.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/67546757710.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/wisoles.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/26098418312.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c447173a---pululafedosawewukomov.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/lebewifowonuwisuluto.pdfIn PDF document text
    • http://caythuocnam.org/images/files/naluwitajitofar.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/55010121535.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905081617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=necronomicon+book+of+the+dead+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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 10880 bytes
SHA-256: 296f71c4e21d2d8904d56f0fa05bdf24e4dfd854b444d7ebad77230f04c1a677
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 18936 bytes
SHA-256: 5efe123cc74a96724038ef75f74e93af88d8b99ee4d4cc1373de8fc429a28d12

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