Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68cbfb1f5db77e2…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 13:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65a309728796b6def342deda9d695e46 SHA-1: 53d18043c720d0660e7e0fde841bca3cff1b6ed3 SHA-256: e68cbfb1f5db77e2260e281c47985ba8f11904bd4234064c4270ca4883f1a73e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://alternativecarrepair.com/userfiles/file/92589605266.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/54e76f64f7153b0d904d8167481eeea3/kusuzixolakesij.pdf
    • http://plnjl.com/userfiles/files/jiked.pdf
    • http://mynigaoe.com/upload/file/20210521103343.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1650a3d26---82476921362.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/tumufokaratekazaxofabubi.pdf
    • http://www.tobywells.org/media/fckdir/file/nuvomelomoxibujuva.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619111509605342.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c79ed25ff---tibaxorutaluvarovite.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d62076683d42e2c53ff1ff59a77848d4/20655345626.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877401a7b04---87684147375.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/97439fbe24650dcc834c277879271f0a/30327911158.pdf
    • http://devison-matras.com/upload/file/13424092556.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea89b7ccc6---16244581400.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ddd7371cb---situwudumuvupo.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/xixesovolikelipebaxuv.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71564b1eb---29820081333.pdf
    • http://bomtvplus.com/data/board/file/20210511061025.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a22a1936ada3172e27f6d586172e9cf7/90177031101.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=life+skills+and+value+education+class+7+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05f.bin
d44f2359535aee864bfda06ba8d75ca9e081106f8ab338b5f91a9a334de1d1fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 17388 bytes
font_01_sfnt_off00011daa.bin
69d4bbf683537fee08a2cc082d0b40307411d07fd15b852d16de196521f76e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 10820 bytes
font_02_sfnt_off000136e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 16792 bytes