Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef67ef74ebc130b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 22:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07ccfcf965cfea625007db4674ab85b2 SHA-1: 2d574b7a229618a436282e01277056e09b90c09b SHA-256: cef67ef74ebc130b3f646924b6e13a4cd5fa356517136c70e1e963a374f951ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ketchas.ru/uplcv?utm_term=vowel+letter+sounds+worksheet PDF link annotation
    • https://tranhtreo.com/images/ckeditor/files/24561032587.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wadawum.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160960ff2168be---bunurakefamujuvesubilavib.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/seredezadiduku.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99739168904.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/zojoguxekimutib.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/vosogakifarutijosu.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/49484637068.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/lodowetirasu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c6a0caf8---82642976437.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/vukerazisuxesetabi.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210804_57DE7A178F2122B3.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083273967f88---jegukuvidapawefekexizev.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fcb0a9d93e---zajanaxokawaw.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/60795758275.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/duwolefevo.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/bafarafaneduwo.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7cf0b573997d3b6567c1ec34b6203b3e/45768277875.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7mkem1mnvuivse5i6dpu72rks/gujakomapubemaximedilim.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/18680209804.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e3507756c---97456011974.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pnj6noi3cllunh20da1t9n0ec0/39291167882.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/luvikof.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/vigafikixel.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a2c3f47f229d90434d593766a07f89cb/63533591578.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/4e7a12b0200f3bca624e63d73e7a57c3/56660935075.pdfIn PDF document text
    • https://ptogel2.com/contents/files/70447719302.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/56664015230.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 10336 bytes
SHA-256: 0c7aeaadaf30da97f38d6ac07af0af54ffcf5c4c86f30fcb3fbb67103bda3629
font_02_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 17704 bytes
SHA-256: 39c695dcd8eb4ca152e739159ab661451510d45f10508495f6dba5f0e1e15a56

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