Malicious PDF — malware analysis report

Static analysis result for SHA-256 9082f9df68e33c34…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 21:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4818df731f8b63b282e892683c8df58 SHA-1: 79207eac2b71d0f8e7e3db83a36bfd14ab75f9f6 SHA-256: 9082f9df68e33c346102e81e580b615660914e1191f2cea049fb5827214bb201
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution suggest a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sumosushingrill.com/uploads/files/32723652236.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f62259ab3---fedogupogefotelib.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/gasaboxevekepedemo.pdfIn PDF document text
    • https://olterus.com/contents/files/2305012403.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/zukovabumuwivakavulomevug.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8ac0d06f9838a65fab44ab931221b63a/kememeziwusivimor.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/73238857850.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/39309564998.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d5074a4b---vofaruvo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138814ed5786---60928035084.pdfIn PDF document text
    • http://futboltotal.net/images/files/81754174698.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/roligodaviduzewoxo.pdfIn PDF document text
    • http://ruihuitax.com/files/file/zalisevazinef.pdfIn PDF document text
    • http://apicn.net/upload/files/semazedepoxoremotow.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6t5t9ete5un79cf1qjmav4kre5/bunulu.pdfIn PDF document text
    • https://baglab.pl/galeria/file/ragatogabemer.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/pezidatusupomagase.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/62711001457.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144d03bf3764---90508637830.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vajivabobunu.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109101745103208.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/59247176925.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/85075782215.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/14259102971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+long+can+raw+chicken+be+left+outPDF 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_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 16296 bytes
SHA-256: dae9eff454ce5f5a6ad98d2f4418e0e9798d953ee5842ae50207876c6a9ac124
font_01_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10856 bytes
SHA-256: c66f1ce69d1e4e154e6f633ef3c6957ddcf74535b2532a289a1789ca41b74f26
font_02_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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