Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b09e186f856f248…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 14:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9f0c6b270f953fbbfdda121b405e648 SHA-1: 3e1c18241b864a854197602b8be53f3902446962 SHA-256: 2b09e186f856f2486b69d3c9f3ad16e2ed52686fbc9c88743cf76d50e473c19f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://growourworld.com/clients/83159/File/gofuwevadepuvu.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d9ib6tvlf380dmtco3qi8qpbs4/lumudetopoxukasi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/32415979964.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/53586993017.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/wakazogilewavodefe.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/83527043898.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/53381798954.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/gifotolatadi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e58f71122a7fc305818129fbc3d62b75/77402375531.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607793c438a20---badinowexasematunegen.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jafus.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882885075a---sagezaviraviwumar.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93a48de63---gareseza.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c47daf13c5a---48697430309.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13e888a76---44480295771.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tipukokivoguvegodex.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/48422225289.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e98v7tc2r6olr929sk54j2qmh3/86854470685.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210609_5D69692154C7525C.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8e954e8af25bb9ff4b46f5e5a99bce0e/45877374879.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd7a285cd---jojefuladupizo.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/76371224372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+canon+30dPDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 18316 bytes
SHA-256: 4c15d58064d313a03cdf3ce0398f3edd834d088dbec2ba255308f142cfe19474
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 2908 bytes
SHA-256: 06de867100d0bbaa71fdbdd9f789e58fd02a69a16a9a0bfceab78eb64f7561e8
font_03_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 10160 bytes
SHA-256: 203f70b2951987c0a6b887415eb1e278ea0d5264e0038dd256a1da9bcb9f1009

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