Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbaf1d40d4f9da7…

MALICIOUS

PDF

84.4 KB Created: 2021-07-30 16:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bcfe6810b0d3754100769d586db4e5bb SHA-1: 2e1af51e5161c4b33f022a7ba498fa350b41e0c2 SHA-256: 4fbaf1d40d4f9da7820dd2814c96b19121519347a98b916360ef87f189257578
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, suggesting it's used to redirect users to harmful content. The PDF structure and link farm characteristics are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609749a3c216c---jepapixikiwadumaku.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/767b0c1455ac67c021859c186e04703f/mufakeku.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tumonutewaxafuse.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/pajerijaxagitejar.pdfIn PDF document text
    • http://splogservice.ru/content/file/pafedoxev.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/95206850112.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094beb32b677---jamavulilefiralaxukunediv.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5db794c29336749b238427d3661cac26/14292365578.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/97507880711.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9faaad8e9---nagasajukes.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/buzuvu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04601db18e---vojiduxesoparevekebuwuk.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/beponumaligoxoduzex.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/51379436154.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/rukaxaf.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/67695638069.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/27603437805.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/sewomofisex.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/65292389861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=formulas+de+area+de+un+rectanguloPDF 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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 18048 bytes
SHA-256: 9034dbfb07562d9c9a66394ea6746c2fd25e1e1f4e4c57702c4ccce6d6720783
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 10700 bytes
SHA-256: c1f08919d17f954e7edef8fc8d0cce340875c268e7703ee3ec5aae0be89717a4