Malicious PDF — malware analysis report

Static analysis result for SHA-256 329143a7a8ef0a45…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 09:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e70f7f08e211ebcef771bd6d5dcbedee SHA-1: 0f1d3b162c1127e5c0d204d383165c022bfb1123 SHA-256: 329143a7a8ef0a45c9f9ff7d47588fbc65eae0d2c40b65507a11acb2f1e61112
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=best+offline+games+for+android+2020 PDF link annotation
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wejup.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0107a499---15934830960.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/48155894019.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/80014451334.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613950b1f22a9---19653728657.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/62627895217.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/bovegofujufavuvowibasib.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613419de9e2e2---pujuselovotudawexubokoj.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9dfe44de2ab7af787a71508040d8a49a/50683364753.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/96364301705.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ta6739fa5g4g0lobl827bgfu2u/rirowedotizuxariludalexa.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/69266501815.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/35522629251.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210922_225534.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/73267423529.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/xupemitibavir.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cf41049736ccb5440256aff84afec402/mizefowiwusolepa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409047c8a69---96311708880.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16131c79184f5e---11810043089.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/podelexagokotum.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rab58jprtlilj8vjce2jojdpak/40590555655.pdfIn PDF document text
    • http://www.toptehnik.si/images/39436636842.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/jizejo.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/12847117052.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/jubanisovozobo.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/19450894939.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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 10992 bytes
SHA-256: 65ef184c72da12c9b99f804090e1824c90f7c1724ececc4fb17b408cbf1a44d0
font_01_sfnt_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 15776 bytes
SHA-256: 7ed83eda320b3cafc04d67320fcb2f9f7afd20312aa63b732abc5905496d7d3b
font_02_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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