Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3ee73e01208daf…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 02:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5c562d24bed640642fa1e9d1d8559eb SHA-1: 6d31ca5649275cc860f9821b472de508a1de5ff8 SHA-256: ec3ee73e01208daf655f4c78cc56720a8c559b317a888ad64de56304867b0e76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting, 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 distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nffcd.org/userfiles/files/91399490537.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddd2d4248---juxukesewejikevim.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a9e48f0---dopanalojepuvodena.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/96051138498.pdfIn PDF document text
    • http://js-space.de/userfiles/file/85688932394.pdfIn PDF document text
    • http://webursitet.org/Files/file/22014371767.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/61698801542.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109020135019497.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/73081662116.pdfIn PDF document text
    • https://partnermind.cz/images/files/feduwawarukuveril.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/desivarumelakesukoko.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/83945853309.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/vexexixafupagajilotegu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8og2shft9vk21rrvr31v9q3ccg/14195130850.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/jovara.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/86390968071.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/13610260956.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/81049022177.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161322478d8e0a---79735195724.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/14391460341.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fcb1b891---69861882714.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/wotudajixuwavafava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aashiq+purana+song+downloadPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/88134426040.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 10752 bytes
SHA-256: 6d0dc886b992f9191294c9a00d41ca70352cb5d730c3b99d0597535e56bd1241
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 16680 bytes
SHA-256: fe60accfea6e287a4b59cec7d2e236921676d2408417e7dcc790c08255ad6928