Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8a38493c074263…

MALICIOUS

PDF

77.5 KB Created: 2021-06-22 14:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ee89994ad0a2c83698e886944a91106b SHA-1: 4f4ed0295a9f7a3501cbe6c934d3a5f24a8903a0 SHA-256: 1d8a38493c074263efda921f3f7726023afb5aa4604bf8d9f9ca2a84ec31a73c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/719b5a52a193fedf4cc3b462c49ea358/80434220539.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8dafcb621958ceba3dd02a1df3ad5659/ruwaripe.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/89109844141.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/80850285472.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/27007811913.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/15483892370.pdfIn PDF document text
    • https://isosklo.cz./uploads/44440891470.pdfIn PDF document text
    • http://veribase.com/E/file/74779498059.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/87570815143.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ca976b44fd54cf4bfb959bd5c9dfd8b3/25633375743.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/beratelonosewutagebuko.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7krh4c04hdj1v3rjm74g7m1rgr/14852751081.pdfIn PDF document text
    • http://babamoleskine.com/files/file/85445561499.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/72117147299.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ee55b8f8---mudugijab.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/afdecd3a3adf08c06f6436fba96cf06f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=video+editing+app+for+laptopPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 4996 bytes
SHA-256: ee6356f431513cb2e9d72bc698890b7396e8d1ce79b5763a96506f67f030359c
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10508 bytes
SHA-256: 9fc282220a2d9b5d0ea179a15a6e25044e3fbb96b8a4ec42f47b093596cb91e3

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