Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcad99317c9df85d…

MALICIOUS

PDF

82.3 KB Created: 2021-06-27 10:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82f426f3bf0949d20e459bf4fcebc05b SHA-1: fd44aeb523a08482b1d36954a6e61f28cc55024b SHA-256: bcad99317c9df85d543770e8953d0f204f94cba9a3de61cb9d2f838cf7bfcf3a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm on disposable hosting, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5c4ca5b836f79f939f3a4b0131f08174/8702715799.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d022c3a4ea---godalomabugojuserapepuvad.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b914eea0e---8600559701.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d3dcbd2e8ac0dda57689fd999d103faf/92512600602.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/682bef1edb6badb213f8138d986ce890/gipebaduv.pdf
    • https://usssecuritate.ro/userfiles/file/21530701470.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609befd457f57---73201018647.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d121c53a75---sefuwavesefaxonenipojug.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596e86560---nuxekukireseme.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5ba6d931---64478596803.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/77ef3843462a3183f60f0b43f758b68d/rijexomof.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/bepibariref.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa2abb660b---defoguxojejifunexidanabex.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/mupaji.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad7a9cfc6---tivibuwizulifa.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38d03040e---zawiwupe.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kinosixokomaxemoj.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d784170f8---14183491993.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/35274266987.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089235392a7e---72647725447.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/794c8516d5315771ab67cac18904ad97/zatotevesir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=english+file+fourth+edition+free+download
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ae03bd18---83001941535.pdf
    • 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_off0000d2f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 16792 bytes
font_01_sfnt_off0000eb05.bin
ddfb9493f080ced7ca4c669e436091b1a78e16727fc2c9dbd437483b448a0fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 22296 bytes
font_02_sfnt_off0001232f.bin
190f8d057b72d44e2cddc400deaccbe743cb33f34d2f78e364f4b52e280130cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10804 bytes

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