Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc2e6597432ae94…

MALICIOUS

PDF

68.5 KB Created: 2021-06-24 18:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 67d3128f08ed9254949c8f8f9db1dc24 SHA-1: aed6d0deb735c345993e3599e210c4f966dcf67f SHA-256: afc2e6597432ae9479cc7b65b9d3bdc1ef296c6ccb5f85d6f1f3a2c16204b99c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://by-express.com/upfiles/editor/files/66992717279.pdf In PDF document text
    • http://bajajsports.com/userfiles/file/kemutunene.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e728fe512100b7b1c35905953f542600/fimagosoz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a68952ba6d4---75578053470.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076de004e3bc---susugijuwezowar.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072426ce199d---pelap.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/u58aurm9cfgc7gphbld7u4v7mh/rabivepewotitaboj.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nisowawajix.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jiremoruzukep.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5efd891a30dacb3d5f59126524d17711/18969138221.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/db2f5e52aeeae04a4f4b25ca4f0fb67d/podufikivakujafogajadegoj.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/46632280940.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3de648d731b77ff68499db1964269001/madudugedubexojotifumu.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jajebozikim.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/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bosch+cooler+electronic+control+manualPDF 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_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 5088 bytes
SHA-256: ba3561dff4decd84ca5f183a38b0a6e7f168ce60bf21b2a1018bd76a5661cab8
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 10292 bytes
SHA-256: b994584b23c5fc9846245e540e37d308a593a41682db939204aefc1d87fce578

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