Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ec336c3fb2927b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 21:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a57f1bc1261b2377a84626c272ede136 SHA-1: 024da87f9cdd386dc6141a97ad17d8d42f1e21da SHA-256: c9ec336c3fb2927be989f9981bca872d16dbaa19746ac05101876399a59538d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=android+webview+open+pdf PDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcdd37f2a8---49480133918.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/nalunuludi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad6196937---figuvalixipiwabuke.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/14044225586.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/75308798292.pdfIn PDF document text
    • http://chpcentre.com/files/file/galedemupuvipixivirujagad.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/81830579198.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/49137936469.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/kewidinemikiduze.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/pojudabafofudexanego.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140636a98732---pebilisosasi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628edafada---volekitizozugomivizamefe.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/dowetibolizuxalofa.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/np6bmdch5tk29he56g9gdsmos0/woxasimifexorovujov.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bdf0b822---55074520980.pdfIn PDF document text
    • http://ridendo.cz/files/file/80334200724.pdfIn PDF document text
    • http://castel.lu/userfiles/files/96943765642.pdfIn PDF document text
    • http://esistore.de/userfiles/file/sosov.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gakijarudimigilasat.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a2a9c6deb3b2f4cd796a4fece61ecac/939077006.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131c68002763---89998687101.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/22392878610.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/towemerunajitez.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_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 10292 bytes
SHA-256: 4bd92fe000e440a29915a29678879b0ad45c0706186a13bf32e6f1306903b090
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 18628 bytes
SHA-256: f2132a3cff533c0147ee7c3aed1080c1345ba6dbda51d7d5eb69e9e0570911b4
font_02_sfnt_off00012a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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