Malicious PDF — malware analysis report

Static analysis result for SHA-256 4524ef7808172bd0…

MALICIOUS

PDF

87.4 KB Created: 2021-08-17 19:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9505f273e49b0fd61d92f64792fb75ac SHA-1: 2c55385770aa5d43f42f4c2508c05992a387eb54 SHA-256: 4524ef7808172bd0f5e9519e96a1f07ba1b36c598022f1d2ee530ba67422acdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://lidiyageorgieva.com/ckfinder/userfiles/files/81709520447.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/53kct8u03it8i3rvibc1vvrn47/dabopunedifol.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9cf23b584c51940c11eb9918785c96ec/49289550943.pdfIn PDF document text
    • http://markone-tools.com/upload/files/gowovukeguwopeke.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bamuzunogorodanofesibe.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/785f6ac9182a38cc13f1ce338ca71f90/mesosod.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14d2bed2b---99219270106.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/duvuxamilisosajiledo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vudugogexin.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/jugaramekuvibamenatu.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fubupasiwefik.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aa0cd5bb6a7f7ec19f9f3cdc0a34ddd/28811436946.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/kulegiwuzovat.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/9aa22f82f9564d4cda42b93ca61eb286/sitozegetomakopok.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/9819876668.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab96bb8f40---23624130696.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cvud7qavgf07n3vqb1nrrakb4u/46490184964.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/kixexabawuzasotomaxe.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/58133703121.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/2558536358.pdfIn PDF document text
    • http://iwishop.hu/file/49057048813.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/4559323034.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/13951113361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=101+%C3%A7anak+okey+plus+%C3%A7ip+hilesiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 18276 bytes
SHA-256: 4bb2c34b6ef41c5e2f281053b8ef77a39803f651d8483f601800325cd8e05ba5
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 10732 bytes
SHA-256: 0ca0648657b8754707af911be5c8760db0a4a48264145d343b23d27f775b7bf9