Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b212b98b5fc4bd1…

MALICIOUS

PDF

93.9 KB Created: 2021-09-22 18:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c23f9e810c7840d42b7487fdc179f55f SHA-1: 0dba0fe696233ae3d769322b7a2ee43b20f30bb8 SHA-256: 9b212b98b5fc4bd11190ab0e17162e2d3dccae3fa769f8dd7eb5cd91e508809e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is part of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://smidgel.ru/uplcv?utm_term=wonder+woman+1984+download+hd PDF link annotation
    • http://immobilieninvestors.eu/userfiles/file/ruzadepoxiropegim.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/jolaxogoluzeju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af938e43a1---33870580191.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a065378881cca2a1bd795af12ce891f8/finiseditas.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/27913527672.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/zapop.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/94536492555.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/52733161242.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tobalujunifavurabu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/75bbe7648b752be41d4d4af494116674/87446314951.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nujekabusewupavon.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210906090839.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/talelofuwezazufidajuv.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/44d1b0a17f0af70ecf90e50a58c6cbf2/61295132121.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/depegeriranemiv.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/97548631484.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1dc53c954bdd2bfa50e5f6cb1ec27d78/gezidolesesifepaf.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/jamenuniduwa.pdfIn PDF document text
    • http://markone-tools.com/upload/files/99946021843.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/perunotijaxekosupetawam.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-22/20210922221615615642.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/40598147167.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/89961285640.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/rujigamanuge.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210917_E50F0AD50463F41E.pdfIn PDF document text
    • 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_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 19708 bytes
SHA-256: 60cb4859e7953ce03b2be8ee4d272e57373fa22cfcd7e7a25c5102a60e7f2ccc
font_02_sfnt_off00015139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 10740 bytes
SHA-256: e57f354a1a9c53f816b7ba1765a64e3f38eb40bbc36899a1b1c30cb5fdb5814f

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