Malicious PDF — malware analysis report

Static analysis result for SHA-256 c605704d38c62604…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 07:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 396f8ade6f9d8d6106e9dfb20a9cfe43 SHA-1: c8d272fdc004d3bc4596fa9b73821bf8d62a1959 SHA-256: c605704d38c626045a8b550036af77850361e2d35ba52c81562017eb5ef90be8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7222

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 https://synerhu.ru/uplcv?utm_term=haystack+tv+apk PDF link annotation
    • http://bafiti.com/sklep/userfiles/file/49402842629.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/24695904130.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/40951533534.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/88534118271.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xepux.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/1449476767.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/filumutodomam.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/22792503705.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/482ca22acce9353bf99b1f5f7ce8b023/89655633155.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109061853372041.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136299523b6e---24734885768.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9321dd8592c0c0f37f34a223a4ce678e/23986848369.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef754ff4e---77658728359.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/gusewin.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411114c8784---72782966803.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/82650843346.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/4237760903.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/nigogisozawegojevore.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/92785416687.pdfIn PDF document text
    • http://hkalc.com/userfiles/83722925867.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/50499741802.pdfIn PDF document text
    • 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_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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