Malicious PDF — malware analysis report

Static analysis result for SHA-256 34170801b2b19ae2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 20:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c10d4a70c18a8d0f681f22af8bc1c3d4 SHA-1: ffdae645fb2b22eaff5714e5b7f8ca2c18e1fbff SHA-256: 34170801b2b19ae2d55fc886d720d15d33d2de376b0f4822460db4bd7fd6cf0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/47225380905.pdf In PDF document text
    • http://trieuduong.com/images/Download/fevewiwefe.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/davexulapewuvivadujejosek.pdfIn PDF document text
    • https://deepex.hu/hirek/files/jibazisipidaxesodefefer.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a375551890---luvekesuxiruzelegux.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/felaponasoxatatidumipijin.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/20454939520.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dca8783a3b---99428277611.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/zitodesopawuzijizuponinub.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/53077385718.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demidibutirukolaxuse.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/zekawexugebi.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gudimizudefemofos.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/dinolodarepepokezaw.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/mafowufogogisubolat.pdfIn PDF document text
    • http://blgjad.com/upload/files/51490986929.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/98380413774.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a70f642fa---58657449340.pdfIn PDF document text
    • https://kaparatt.com/images/File/20109683692.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/nokevojujavezu.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/63373388789.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/56085318587.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/rubojujopewuginidag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=c+tpat+standard+pdfPDF 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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 16964 bytes
SHA-256: 317f5fe69fb056ce2eba7cf40ad8fa8a9bfe5114902110738c680cc4f53d15a6
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10132 bytes
SHA-256: 179bdf4550db98c27f6937c64a586cddef09678d1ea3e908e1b54e5decaadcf7
font_02_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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