Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc9a7df5b0069d1…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 03:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18a0376b48375a26b4862a8e83714d4f SHA-1: 87b962dce19e7896c75bc2c5f664b12094255ba5 SHA-256: 5fc9a7df5b0069d1ae308ec2830577f2b3bc7970a00caf9317084a0c05efb9dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's part of a phishing or redirection scheme, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

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://wuxihemei.com/ckfinder/userfiles/files/20210613_065712.pdf In PDF document text
    • https://thefertilizergranulator.com/d/files/75166545530.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/12176617503.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/61417304462.pdfIn PDF document text
    • https://reniuved.it/file/zogatudomaberosiju.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e70d01bcb---30631688882.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/kakijikig.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ed8d63e4---niguvosoxegewenuzebosirow.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/41797872221.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa6ea092d---42479381666.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/67f1703c6480d40db4cc2a40bd9c558a/rukamak.pdfIn PDF document text
    • https://pellevah.com/upload/files/12236086318.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/41067745510.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/45309376697.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/52908212811.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/202mtlvr4l95ngilic5qhci0gh/47458255260.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/82209430167.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/83489211608.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/79052203680.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/32512726314.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/wukolidifetu.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/38123831523.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/tefofegofijezirobeweb.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/99078ea7d24cb0feccade370c4188189/61102197524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fluent+spoken+english+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10824 bytes
SHA-256: 72a9388c42c723ec96ee7a73a8cffe7490a2d6f61595c640d627b849a0405040

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