Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9408938f386ca17…

MALICIOUS

PDF

62.7 KB Created: 2021-05-10 00:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100b09a33d9b5d90ae8d02d014935fb6 SHA-1: 9f2dd4842c324f37d9937726e15f1239fd32b30b SHA-256: f9408938f386ca171e2054d0f1e638f737bbe11c26896a7b35070fa31ec081ff
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8036

Heuristics 5

  • 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
  • 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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc04dd7c2---wavewit.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160781bb149407---32379672659.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6eb33c17b2dfaa5cf8bd6dbdd375f7bb/letikofi.pdf
    • http://allmedicus.com/userfiles/file/80619818252.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078686b99ce5---sikatedulivenopakag.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b345c0f46f37c67acab8784ad0aef884/vafabozag.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k2dsv0t80ne0nkufi2p3spjnoi/45170882602.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aii1vqt31bmjh8ekcbrlk0mkej/bomijopivaxamuzu.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076f027bfb83---vasukazinuwedeke.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/81375154483.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753ab288474---21012496543.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c101cc14e---24733938910.pdf
    • https://luyenthitoeic.info/userfiles/file/38534228666.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/adbee8b447ac5c9dc5d3ad8a59fc3c74/ropekufubumebub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=aggiornamento+android+10+q
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f1.bin
4e078cfe94d60bc5172c09b387e655b86f4d645f234bf9cdaae9af3dd30494bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 5032 bytes

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