Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2afa953cb2426f…

MALICIOUS

PDF

91.1 KB Created: 2021-07-13 15:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5a3c8532e1bc565a589248e54d677d1 SHA-1: 57c34328dac8e7bbbf3d91a81be7aa65234c0644 SHA-256: 5c2afa953cb2426f1ebfae943192d35b88b9dde6bc71edb74b60463145a01652
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs and link farm structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/43189302830.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a705c3b8e45---sevib.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fkc5d8s061trdgnel6agk86u68/60961867711.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160867872b6d21---83358036836.pdf
    • http://harchovyk.com/userfiles/file/8018230318.pdf
    • http://al-bandak.com/userfiles/file/kiwuvina.pdf
    • http://backkwang.com/userData/board/file/pavewi.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8bff24690b2529be0084b0cb99e6da32/xusipofepakasapuwoleler.pdf
    • http://analogsys.com/uploaded/file/14500780326090e85d186c6.pdf
    • http://dnepropress.net/files/file/17484830212.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87d683bf9---lonudesafumobi.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c4413221---85775501149.pdf
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/kugewaz.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7707ac36---muduwibowugaputupe.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5aac8dcfe5967b7e6dae48c6b4618fb9/5595205679.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/da96de98cfa895fbea42b54de33fd59e/gurikemoropupobe.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3bbadccd4---44096775817.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160975a559548a---kalomefevujotux.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670c611f61---81888121928.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e92df832---risosevebuna.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ot9udrd3a9105eu5s970msdc03/94119783549.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607877373b5e7---tilutilufem.pdf
    • http://paillasse.hu/userfiles/file/26823100905.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3789fdf07a5744a5cca692e01896b659/25207657659.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=drinking+with+aleve
    • 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_off0001024f.bin
8bf6270d35c613917bde62c1df6c2e87b73564f2da4a795685be8c03293bfd08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 10344 bytes
font_01_sfnt_off0001199a.bin
73eaa6e7e34ef05f546e7d7b82a87820301d3021659ecff48ffed8836ec9b180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 17432 bytes
font_02_sfnt_off00014755.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14755 16792 bytes

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