Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60cc3960f5c56d8…

MALICIOUS

PDF

101.1 KB Created: 2021-09-01 21:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 742aae8219c9f6b3841bf87551e0fb28 SHA-1: 8dc1d70e52c755ba2f3e0ccbc5ddfc619514b0e2 SHA-256: b60cc3960f5c56d843baf06ba17e27da17d883a50c8bfcb9d66247c3878e5126
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://esangsok.com/upfile/files/ronuwivozesigiraxofuzumi.pdf In PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5f7a1c79---51517711214.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f7a3a018---folipumepifidedi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mekamofapunadar.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/76353816745.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/17638544911.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/woguleripibubob.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/xafodubuwigoge.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/25402823970.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ecd231c---79063375895.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ef190ebcbd751aeff62e54c08e00c254/93744671935.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/diwirizagajupi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/80783600806.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/p6vmfc0sf7koer4t7kfrbam193/kinapunazulewafera.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/70156403727.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/podoranusuzobudutuvanopu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daed58f37d1---61692961283.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/papupuwinizi.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20218191831587661.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/befikifivuxunafav.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/namimeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=reading+answers+raising+the+mary+rosePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0ff3bd4ca87fa085c271c9a46e716a44/60421822478.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_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 10892 bytes
SHA-256: 20622ef9a58ff035930b860ce94b1c60259e167954c1085f44bf1aeba03313a3
font_01_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 22652 bytes
SHA-256: 3bf2f518874eaf37515344c650190e27d17cea2420db5531699849bbb823b605
font_02_sfnt_off00016bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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