Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c8d6b5fba91d27…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 08:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5858970f9fe14d9a7d0c157a8586a0a3 SHA-1: 31b4a2a56cebf2a7c3d1ba82d83373926473b2d3 SHA-256: 42c8d6b5fba91d275774fd3ee6527ef4117276f57f83d752bb74b23c6d32f5cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and link farm heuristics point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://blnk.eu/userfiles/files/96415818488.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea2618b2d---25147956971.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/69842608093.pdfIn PDF document text
    • http://elitvorota.ru/f/file/90130105181.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11840d64a---8162245547.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/manajapusukakazidaneka.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/fafosoragipimewaxumirirak.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/28479991583.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0d0fe0f4975eef9a8347a094555c83f8/bomubibagukezozimazizu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081036ee9044---pukenowiru.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/360caa245c95ec0a36f73943217415a4/21311533227.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/rupulinipanut.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/diguwa.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/kowelagulozufiwag.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ugbeti85271bnkurh5tghaktq4/luxurelonowimusavunavovu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090822fb11b0---95178659696.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/nukinewemagenow.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806844c7105---51216680874.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gawavutod.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0707dcd12---kabijakopoven.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/35c12304a9624838a8262c36ac50a785/92449368885.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c0adf802---84261194183.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f1227157---dazizov.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/bodarim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jack+frost+claymationPDF 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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 17120 bytes
SHA-256: f661b5849a0428d6543541170eba69af18224faa7e3bf5e9d78a7eb839328b64
font_02_sfnt_off00013438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 10564 bytes
SHA-256: 7b3a3dac6cf9245dab4ccaaa321e55de9a1872862db27a013915843d0c58bea7

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