Malicious PDF — malware analysis report

Static analysis result for SHA-256 834ed8485b026e35…

MALICIOUS

PDF

89.2 KB Created: 2021-08-09 07:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 94629d00015b5490bddaf69c88a72f85 SHA-1: a11534ef6b18b0c9441e5188bcceea3c81f891fa SHA-256: 834ed8485b026e3539bb2069ea6efd8f6ee27448588b04405f95df68bf46b6f9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but indicating the file's structure is likely exploited.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bitree.com/ckfinder/userfiles/files/948418712.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12ed8f8ab---87336272685.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/sazejuxumaw.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45170246970.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/92251754380.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/kuxalepi.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/103011068260faeaf67b43e.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/wovejodaronemepupikona.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8e5bd62fcab7dd883317144da4361091/rifesumewofotajo.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/74377135562.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/73793447929.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/prt8mr5ilaq9rc464g0106rk58/4365726368.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1189c1f69---dikor.pdfIn PDF document text
    • http://elise.pe/images/file/38970876896.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/56ad5e32f934a933ffe0a8fcd1f9d361/84127048066.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/netixuda.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7812d68df72428a1e0d8258e5dd17a10/japuniwina.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/20502071506.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tkegnfodg0ohcj06gct2r78vsg/nedugozolubovireraguje.pdfIn PDF document text
    • http://fruitvita.com/files/files/67281202584.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/21974933633.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/galuxilos.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/piravoxusakiginup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=appendix+format+for+project+reportPDF 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_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 17480 bytes
SHA-256: b286940459d684df64d19a9de8b466494bf234d520297347f5739c1db835783b
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 10780 bytes
SHA-256: edec1a0e5927b17c7ac4865116d5f02fc8b0d6b6d982bf92c6810cb218f054ce

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