Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a01925a2bb4b67…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 16:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab3afc66a8805cc1985f787e129c876e SHA-1: 4b7a5cdc2cfb8b1b891e21937e71d688d62f3ba2 SHA-256: d9a01925a2bb4b67dd2c12dce8124f432344f17beeb7078c5a0645c4c4f73312
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • 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://www.cda.org.hk/ckfinder/userfiles/files/sewurudej.pdf In PDF document text
    • http://mbfeed.vn/upload/files/samewegovosaxedulomujitod.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/60a35323825bcc0bbe87da2462b1d31d/45122587585.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/gidewox.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/3694729617.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/19649541790.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109010901041137.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/bivikibagugadibovu.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210909132617.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/24896922722.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613310a07d7fb---kuxefekagofibolexagefil.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/71866522937.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/34847352155.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/muvevu.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/6600542713.pdfIn PDF document text
    • http://gabortech.com/admin/file/jebavipagerimelagenerejuv.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/24887503030.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/85c2ddef033a680ea422cc6e25f3f1b7/31155162773.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/25984427923.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210905135533_431823.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336fdd03520---43487465029.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/90528651862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=la+muerte+llega+a+pemberley+pdfPDF link annotation
    • 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_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 10668 bytes
SHA-256: 329bf976dc2deced6cefae0cbe6e61546e6ba5fc39de5057533076a2e3cb0d95
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 19752 bytes
SHA-256: 49db1a3ea4e7004c7025961a36d6471b438086878722b9038b0c0deda4225253

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