Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56de3113f9f7cfb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 02:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46a81efd302c3ab345a06b0ba4993ced SHA-1: 094a79589eff83d6121ac30220c1af99288df6d4 SHA-256: c56de3113f9f7cfbfc5f4bc2155e8470e71a70ef417cbc27a7328193771d61d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://archism.ru/uplcv?utm_term=milk+and+honey+download+book
    • http://hexindechem.com/upload/files/kowawolite.pdf
    • http://www.jindatunnel.com/up_files/file/nazuzuzasomudadupadut.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1b74347775b08663c3d35dc7f26ddf25/33596226176.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/099a417ebb5c6ca1214323b6b9052a5a/jureponiko.pdf
    • http://vatlieubaooncachnhiet.com/userfiles/file/xaxokimarukagowi.pdf
    • http://xn--eyt274i.com/upload/files/bulibisozoje.pdf
    • http://marathon-gexin.com/Uploadfiles/files/zanonogadikixasataxo.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/86921688363.pdf
    • https://driftwoodcc.com/userfiles/files/36108016173.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2b5ed341fde803f627936b0db9e9ae62/dugejopexis.pdf
    • http://korsorlampang.net/user_img/files/94091574881.pdf
    • http://viswinkelindex.nl/images/uploads/manobazefabopudubodi.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/dorijumukijerawijute.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e1fb8492bbfaef5cd46a557d9b2d56e6/xoletip.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/difupatanadanimabuvi.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9644e63a---85949126182.pdf
    • http://langeline.com/ckeditor/upload/files/73425584859.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/92443910431.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/65557732560.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_off0000dc5d.bin
fad75e4a82a763af333030968189b8b21ec6fd2dfe782eb2e7ef437ba90a3382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 18072 bytes
font_01_sfnt_off00010b86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
font_02_sfnt_off0001239d.bin
39eff198f5f10495e627385117e405c3e1a1ca3c2dbab9abd98bd7137aaad4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 10404 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.