Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef76835e71333c3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 18:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 260c1843046972cc29c6d49f52db4dea SHA-1: 430f0816b0237f4a9c0692b3867ff72c08adcfd0 SHA-256: 4ef76835e71333c37560aa82c9f56870d18b7d428727aac95e606fb73e6ab87d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://rux-thai.com/ckfinder/userfiles/files/tuguweveza.pdf In PDF document text
    • http://abwnickersonplaza.com/uploads/files/gevidamexuwupagikev.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vuwuwiluzuluvisokid.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/53318e298ad0d28c81cb9bc1e3171435/supega.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/mabitekegizin.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161324a5f38505---46721112418.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/45863302157.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/denarip.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/wadosaxutaja.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b46e80d25---5967546375.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/3721311892.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/60151573294.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1d73be54---gifasegakakuzepof.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sevejosipatemugadi.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xokirozefomozune.pdfIn PDF document text
    • http://stevis.cz/files/file/sopivunagirasatujav.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/gugituxubenafemoziguperaz.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rukariwabudikapimoseju.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/91598119826.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/wadebudiliviwutupibibef.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/80338767414.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/14098465997.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/74272892510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=advanced+english+pdfPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/39415413605.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_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 17016 bytes
SHA-256: 406040063f766089ac6a0681ec29d6d2c113834eaddf32522267a1c33e3219a0
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 10628 bytes
SHA-256: 37ef9e632bf8348d0585d4b37a320baf008c910c0ab0a845bc53b478faf1bb52
font_02_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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