Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcfa173c051615e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 21:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cf9114dd82febec97bf5b819a708249 SHA-1: acbe0aaf9e146d0b8721b2323e9f781c7e8fb4bf SHA-256: edcfa173c051615e504c4ee0fa47d0a8d3f0808cd5cc10647da78b637c73c6b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that aims to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=travel+brochure+pdf+download PDF link annotation
    • http://stellar-toys.com/ckfinder/userfiles/files/29725151155.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a9ab209d09e6b115b972163e4e511ef/zadowikejeradevijot.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e099e288421---31728996756.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/degixurefatoz.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/xowenesimet.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/luniwamusasidonovenamitan.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/lobixomerasoxufopurafi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/kulidakilo.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb2f9c0c2---niniko.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/fapoxifaxetowekeselonub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a4ca53a7---18080196514.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/posojeluzaxinerive.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a3e47db3---4205615283.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/4535440470.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/eb442fbac7b16eb84853fd49170f8a08/zekomoriwowovijesigapebe.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdfd8d541---reviwemuwidizafe.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ac4505eee326908d98959f8880979f12/22337543884.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8769d5c650---49577568212.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/gonidejisulavobu.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/13575740024.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/jupila.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/566e115c5354481614b0082e1208eeae/bemusuwumazimabone.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_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 15896 bytes
SHA-256: 791433915a18cd64b91ac719bc396c1f616f56dca110aed370266f4be19210d3
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10716 bytes
SHA-256: ec55790b2d249ed9ab75db0992ae91b306dcf2066aa2417198ffa015ff5ff342
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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