Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad07693af6cc9979…

MALICIOUS

PDF

72.9 KB Created: 2021-09-21 04:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 802cacfc7ac8e64f447a6b6acfd8bc61 SHA-1: 76420ca12ba8f2cc18cc5b3967f6e635b285fa8f SHA-256: ad07693af6cc9979b640cfe5598172859adb2431cf68f66e73ff6167d87d805e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to manipulate search engine results. The embedded URLs point to numerous other PDF files hosted on various domains, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/02d5bc0b9fabeacf4fff7a2a43085c27/74048912328.pdf In PDF document text
    • https://sjaindonesia.com/sitefiles/file/38104468288.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/beveseponemove.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/rivebaxotuseleruxitu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-17-04-27-31-24.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/jirodobaturigidafilimar.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/44680445293.pdfIn PDF document text
    • http://ipllaser.in/uploads/13983682256.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/38581712779.pdfIn PDF document text
    • http://geraldinekilkelly.ie/11439770329.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/kosibusage.pdfIn PDF document text
    • http://alltechsro.cz/files/joxetuxidibakeno.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/73696797036.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316049c9f2c---vudijefawedumineselitewiz.pdfIn PDF document text
    • http://capri.lt/userfiles/files/rukesizikifir.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/52894289260.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/91559597220.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98332714281.pdfIn PDF document text
    • https://zhansq.cn/upload/file/vipejarazulaju.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/sovip.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/31534085148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tweak+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 19152 bytes
SHA-256: db8b08f8ba46b92b813c6ff9c50d967be4adf36cabf527755d8773f25b8cc056