Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9e3d00723f8516…

MALICIOUS

PDF

69.3 KB Created: 2021-06-18 02:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 36c3e4ad381c7644faeaa65f75370d55 SHA-1: 9fefa79535aac28c8b0bb96a5a4e78362c23d828 SHA-256: dc9e3d00723f8516b8326e991a0aa5b655f7dff56eb346ab1ee428550fb5f600
156 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 0.9672

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://queure.ru/uplcv?utm_term=servsafe+study+guide+answers PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086a6040a003---rumiguvorivatunebegazise.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dazukosatasejumifiwe.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f9716f5b7---tisuvuti.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7530d8d3a6---kujefizabavepanugegi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3ec15483---27830803001.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/0r92tq9att1lv5nt1o3vu9o0d7/52427759191.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210531_B7FBD3E864237AFA.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/86190119841.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb706a5c8---lanivezedaripiwirubo.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/26714199256.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/gogovexevuge.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/r9p3khi26iecfjf3kb1moq273i/gukewedixuj.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/34420199363.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd513e5e4---890551118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 5400 bytes
SHA-256: b3ac6be93bda64383a16f53587624a69c5d9bf0d4d497b50438ad189ac2b8528
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 11380 bytes
SHA-256: 0e93f40e6c18b9d6d89f521e0418e598d0d952a4702412033ad2565ad7ea4d2f

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