Malicious PDF — malware analysis report

Static analysis result for SHA-256 66252e7c226ff9ea…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 22:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dce4dee17c45a4354312b4034692333 SHA-1: dd91fcecc3492c7245e06f52a83717b2ef61ffdc SHA-256: 66252e7c226ff9eaa7926fde777aebc13154c06d287b012b120dc8e2b7138909
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure of downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=free+online+maths+worksheets+year+3 PDF link annotation
    • http://tokyosushilohaus.com/uploads/files/gifen.pdfIn PDF document text
    • http://atek-ent.com/upload/file/20833111707.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/viwikafuj.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/5980812290.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/27050831047.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/99389441446.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa19709fdb---42157830807.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/kovijaladiliwipugapur.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/26690095326.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/80546512950.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9df4736521---tadimibarobobikis.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/57820241989.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/25779714505.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/19810868716.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/84960694608.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/10390023319.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/82706303785.pdfIn PDF document text
    • https://atl-50.com/files/file/sizowixexuwalovesegotop.pdfIn PDF document text
    • http://marketingnews.fr/images/file/pukujajugekogu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3f10aea9f8cabfa9d227f09cfe8b4631/potuderem.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3a61b45bf83db6117f77ffb09e558e63/riluwen.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/vanafudavu.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210801044237163099dmt91l.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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 10816 bytes
SHA-256: 72e748e1c09a0e1892f70bdc4ac44515c1b894a6695893f6164d972402702965
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 17728 bytes
SHA-256: f038354fb7e633453a8b93870cf9fcc20d98d63c36d26f0e9a29feaa36a2561e

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