Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ef855cb84b917e…

MALICIOUS

PDF

85.2 KB Created: 2021-08-05 01:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: cc56a3de80283866394f7c2cc5910612 SHA-1: 62eb47cad8a82a561ca50556f8b4d5b3098b97fb SHA-256: 65ef855cb84b917ed01742325935c12933d83e10eb805de0ee99f8aadc76bb97
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maihome.hu/admin1/file/wojejoxavu.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608616b0f2100---69677752913.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8bbdd6ec---tigupaloparexax.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/gofedumuxugulavez.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/10794404164.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/rekatamexefuzusove.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbf844a5ae---44495211080.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/375383017.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/90950777611.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tifebutipiteku.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ba2ce5d6ec2f70ef0e45d658fd0711ae/powiguxeku.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/85116309689.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb53db3bed---19904305564.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2f395305---32181659605.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/piramilezelimarikunot.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/elhlcfnspnjc20esbcl2dcc6d5/13152976185.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/21109003637.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/pamigofasanutuwijovamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=railway+concession+form+for+cancer+patients+appendix+1%2F18PDF 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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 11420 bytes
SHA-256: 33cccab198e2937e57e062960c648ce0f1ca85f4b8ef70cc87465ef3c0eb07e1
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16596 bytes
SHA-256: 21bd10ea09a63b6a24536e406bb18083bda08a23a508eec13b3b846e3d55bcd6
font_02_sfnt_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1