Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffc072725efa483…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 04:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 636a97e447ba6c6f5fc7bce6e69954a7 SHA-1: cf125033b4f588105d4310b9e19599d163801bb8 SHA-256: bffc072725efa483545d7764ed18de819959bf82164f45269f478ac91bed175c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=examen+de+conciencia+pdf PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b766b4816d9ed24a653d1c632f7d4442/posep.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/zugapivofewakexovefuju.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/34969517557.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/88060305031.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed68026015---61954354265.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/22cd13cfe6ab662758b496190970c023/93459276545.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/88937043887.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wabivigisivivuzuwanavuwe.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/27259316468.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jujozajimitan.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886df7cc31f---51968142409.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/27208150708.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/87eb591be64aee62a6078ffc054689b1/58458753306.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/nezugi.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/5556092023.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebebb36d7---13021395356.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/61637752280.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/41597317460.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/oltc6gc7vsqqobaifboa3t8383/55946523614.pdfIn PDF document text
    • http://ozari-ua.com/files/file/komupe.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e4339ac457a---10817318419.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a8fe33d66fcafac1d66ba7003c3b69fb/lifunadamuguxe.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/bulifubimisipetaxos.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/29731935185.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/vaxaxemono.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac9a47e9d---damevuzagixa.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_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 19768 bytes
SHA-256: d7bfeb85433edfe94674dbd948906b7b98e7584435db82b756276ced81f2ebce
font_01_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 10456 bytes
SHA-256: d94146b948fcd9011a9c3a93636829cc5254096723b067ac9efd4a9e13b889d5

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