Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3f9d8c24f2f30d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 00:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8451d0542ecc2f036fa891f0d3dd984a SHA-1: fb5d1cd75689b8f6069a4b65c5f4606e69969064 SHA-256: 3f3f9d8c24f2f30d09a28707d0761999f17667ce51ae7d15121437f602b95d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138129a89151---48009850115.pdf In PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/99197656821.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/zowotuso.pdfIn PDF document text
    • http://netflor.pl/upload/File/sebukaneriwolop.pdfIn PDF document text
    • https://ahha.az/userfiles/file/53485499451.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uhp0b4dnjbjl9aciv3nlndnann/jujujujufo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/68591944126.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/95073776961.pdfIn PDF document text
    • http://linza-market.ru/upload/files/bamalarixijereronalenava.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/89304235371.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/satosuf.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/kovow.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/pebupakoditu.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/nitaxaf.pdfIn PDF document text
    • https://ocw.tw/uploads/files/luzexafomujesenozima.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/16876138868.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/24179754211.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/kisoviro.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/15792946917.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c28388cbeb6fc55db97888cda824dda3/70146747988.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/70996ed4e351850074e85f753f034a9f/39825987304.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/minizad.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/sezonufijufujadaf.pdfIn PDF document text
    • https://digireg.se/upload/kufezi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae01c4c91---xexebiliwuvowikelomozov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+untamed+ep+4+eng+sub+full+episodePDF link annotation
    • 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_off0000beeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 20928 bytes
SHA-256: a65257ea62cafbd9293d4f78abafa7ef5a271563bda9a600841b3f865b03141d
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 11128 bytes
SHA-256: cdc8413fb54544779c000be76740df558282bccd4963d67ca32a19699446a157
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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