Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70b905bb91e7268…

MALICIOUS

PDF

123.8 KB Created: 2021-09-02 19:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 946023cd2daceff618991e8601df0c11 SHA-1: 2ffb90c20c47bbc3a2f04c0d789bec258ebaf6a8 SHA-256: f70b905bb91e726867a28c5b7f84ce1540be68a12aaf71946ff80b6fde88fa64
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common technique to trick users into executing malicious commands. The numerous embedded URLs suggest it is part of a link farm designed to redirect users to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://medvor.ru/uplcv?utm_term=allen+bradley+micrologix+1100+programming+manual PDF link annotation
    • http://consade.com/userfiles/file/bomigakor.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/91906078899.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3ee5c389---powojaxagulozuna.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c608e4b231f---susiwaz.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/lofibarufujilagezenonuwed.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd57232ad---85318182300.pdfIn PDF document text
    • http://adveotec.com/img/file/meruda.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/kk7pd4stfcipo3b8odernp9ce3/sozafojavabovixawerew.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061904304878.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/42855961689.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6d75953e45505bd196f34b59db3ac5cc/72738801919.pdfIn PDF document text
    • http://dongphat.net/upload/files/94420247534.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1bd999a4d---78372500287.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d59fbec34---todudu.pdfIn PDF document text
    • https://songhong.info/userfiles/file/bafasowewiwipugukanewari.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4d38965d---vifusa.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/votume.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/61211332193.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/89113557925.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5869040e94---67131716477.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/tipil.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_off00017c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2F 11200 bytes
SHA-256: 18016777e0302ff16094ae333c40fd8452c1d6461bf38f9dbb33f43c7907d452
font_01_sfnt_off000195f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195F3 19756 bytes
SHA-256: b4b5533dc1c95cf69acb4d343944477bfc1296197a1cf806d1a98f55094c448f
font_02_sfnt_off0001c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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