Malicious PDF — malware analysis report

Static analysis result for SHA-256 186affc47d242a7d…

MALICIOUS

PDF

134.6 KB Created: 2021-09-07 12:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0c9f4da5908645abf1248ed5b0cb5df SHA-1: ee03a8350e5286abb75d4db8fa334ac1a7be5543 SHA-256: 186affc47d242a7d4b426ba4f3c0551e929008adf14956cfdba420b57858458f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9456

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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b2680d2c1d1122ea7d12d978379b8b72/jumavijolula.pdf In PDF document text
    • http://plnjl.com/userfiles/files/mavubasisawatojavarorinex.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/8923956423.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/93109604435.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b5e313e8fe1508985d2f992f800d312a/pawipogemawemavu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cc79eeb5ab9b7744549ff9d6497f804c/paredaw.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f1c2cf66607---warorixifakikaxe.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/81f7750e408012220a2f3d7563a2fb5f/kawotafarob.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/6269420376.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7fd4e511---vajokike.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c577c2b93---saramun.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d34ccdbf---pulowevuxofafevobomu.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/31955427709.pdfIn PDF document text
    • https://ntc-container.com/upload/files/51416351759.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803128a1f17---gavafuta.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6c60c793cafb03c21f7e9c37de8b5cb5/suzegi.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kixuji.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102964e00150---95509467319.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/wimitinesakavafi.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/35014665074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=livro+de+estat%C3%ADstica+experimental+pdfPDF 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_off0001fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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