Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d3df265307bc72…

MALICIOUS

PDF

65.1 KB Created: 2021-06-18 00:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b31ead9ca070cc1bbb0178e7a64a9384 SHA-1: 81b074204439e57e34ad50f8509ee36ea5af0b44 SHA-256: 69d3df265307bc723a541a76c69133903b30ee422c031fc87110f62ee5494c8d
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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 http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd9b742932---47266127654.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/65mrrcfkssal6v3q8agqq7u27c/98322645668.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a63d05511---dozenusufesagulilizuludeg.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vakbd7m6om784f0fgqf8pq51ce/sedoguxolav.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792563a138f---rezesi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42faf3ada---remirala.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a7c81c2a---zaxukokoruligidokomedepet.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/21062521383.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/68817828315.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/30223897142.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce328c51cd---vifafarowugigafu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/naviwukemuzatonibetav.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/xopuranewaliwok.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/23016861577.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vozibopolid.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/22455145624.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/zMnd8XtcwSM/uplcv?utm_term=qualitative+energy+storage+%2526+conservation+with+bar+graphsPDF 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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5076 bytes
SHA-256: 77b4b95fa69e53d42704bbcd792c54208a5afabd5213c7146907e187d7cdb81f

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