Malicious PDF — malware analysis report

Static analysis result for SHA-256 c740d157840821ed…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 05:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2fa29559a8cdd38ecb80961d2ebb2ae SHA-1: b39c66eeec701c47ee6730becea469b2c9c0cb3c SHA-256: c740d157840821ed2bf4881687173163c82199d9dd7103bb5fa286d8a095526d
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 pointing to compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser update or extension. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware delivery attempt. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

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 https://crysiq.ru/uplcv?utm_term=ads+chrome+android PDF link annotation
    • https://eventaipei.com/upload/files/30662239815.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/kijafekedaxojomaregura.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/gizulopojena.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/85887067334.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nusapagopa.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/wudovo.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/98435629104.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/1363331414.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/44796881742.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/65049080779.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/11483705958.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076df9f035---80599953097.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b8ec6ba7---dajezabetekirubumubiwumuw.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/gosil.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc01fd82e5f1537b0967cab7a67f5622/fidurifamurebonelege.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/39092373155.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/puvumunabopove.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/jodefuzefamiloxovesumogu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/do29p8i3982ml3he86obdogofv/patakexonefinalukefega.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/11558799226.pdfIn PDF document text
    • https://topupdana.com/contents/files/701745175.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/69917636309.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/36d9b1769c6fff2a97ddd1853f448880/puzugowo.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/xogepezuxogugi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/84181145978.pdfIn PDF document text
    • 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_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 17368 bytes
SHA-256: 6fbf77d173f774d687815e42e94719ffb6e53ce7a51264488746286f67abf9fa
font_02_sfnt_off0001341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 10472 bytes
SHA-256: 7167c8d8b6a4ef4cc214eeee99ff7037f466d28b18267488f142e37bb60d815f

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