Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c6795d7c623c15…

MALICIOUS

PDF

57.9 KB Created: 2021-06-18 20:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 88dc164de6e0a55692895c33fbdc6ef1 SHA-1: 4ae2a6ebaa2030cdb86753f5f4e9b7742b1b8a56 SHA-256: d7c6795d7c623c153c114230fa7d806391f6387fc40850457f499c6fbe0b527c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

Heuristics 5

  • 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
  • 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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5137fd7ba2---32925552519.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465d6a69f7---60995628146.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/80697780029.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/8bpmjrl9n0f2b9ie7rclinp36b/xirosumapukexexomok.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5310bed5441b7f929a25117135fd63b2/xekixalawezinakida.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xasavexeziwanaronijafos.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/83016278292.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/38709006627.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lalomofuxivega.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ccccc67d97eede87b1b15a18e63789f7/gixugejasuf.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/669279390dd25fc4dc079b383f222ba1/87054012323.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210528035109.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e0705182---wapopilomazonaxexubojux.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a737810db16---85978740958.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160862d1c5ab18---firifutusifinod.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dec113077---88619246354.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/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=video+editor+glitch+video+effects+proPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 5232 bytes
SHA-256: 05d9943b3d5d56d8fe1322bdb325e8eb68313ff754aa48543d24d9080ff675a4

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