Malicious PDF — malware analysis report

Static analysis result for SHA-256 875f6321f41666aa…

MALICIOUS

PDF

57.6 KB Created: 2021-06-10 16:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3010c6d357f90b8ff92248cc50bcf73 SHA-1: 927eac5cb08dc903cae8623c646625070bad6d0e SHA-256: 875f6321f41666aa54d2b20a02a7d5f47d69ec31a474f944e20f881a73d85e49
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards a tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8773

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 https://philabc.ru/uplcv?utm_term=hojas+de+ruta+jorge+bucay+descargar+gratis
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cfc85360b8885db0659c52d496a491a5/22663677983.pdf
    • http://adveotec.com/img/file/33892065328.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162309776175.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4c3e23637a119cc2256a812207dc605d/63630972124.pdf
    • https://people11people.com/uploads/File/55492340843.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760087c1ea8---xobukonifub.pdf
    • http://chi-kara.net/userfiles/file/zodipumuj.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/80cbb4d0c45675b84be6884c60bbd5c3/sixore.pdf
    • http://ampletrekking.com/userfiles/file/lokeg.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c898fbe4c114012462a475b50daee8cf/ropolebagir.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9d4a0c224a7e82e9e18db893c873f079/xeliwupepub.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3corajcesci05t98ef84uqsejb/74623102036.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94b041ebb---nokemigomefoves.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160985a94667df---19957332563.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e46ba58e7284ab4cc55ed41d91460f07/92498062144.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6692a77c02---nezinifafiminamabiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42f.bin
cdaff842e1a60417ec506be9a0715c84d075ffc71c7f105fd27d25f893ae0434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 5352 bytes

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