Malicious PDF — malware analysis report

Static analysis result for SHA-256 000c99a9c6734896…

MALICIOUS

PDF

70.8 KB Created: 2021-05-22 11:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5353276f47af8b42b98e935d6debd82a SHA-1: 72109a80b649821f29d6f3e7ad1e140bd32bf94e SHA-256: 000c99a9c67348961a74670d7b46ee3742e4c189b3a0d93c37f711ca444f78d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links pointing to other PDF files hosted on compromised websites. Heuristics indicate these are part of a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9717

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b30e420fc2c3b10c1786180bc16803f8/kiroze.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a076bc17fdf---dokivebus.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f411eca5f---towodut.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lf6k2ckb91aa2a12hmng46njh3/vexupetoteruxipomedaw.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160980c902f1e1---17435363588.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088d6e12a952---xiwadaleraret.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/e0267pj29919sn55721eb1us17/wapoxelororo.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a743d6d44ee88eaeff54f2f6c516318/62815781972.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddeb16128---xodakapukozikuge.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f16e0304475d7602756fcf56afcebe38/30487944402.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1ff0d844---44012167759.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lom657mr7eaivbgqj4ukr7mhq1/juloboxovaza.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/g32qg9ihf82s6jv607mfgd66d4/85666952768.pdf
    • https://aartipalette.com/userfiles/file/5926140751.pdf
    • http://komputerzagrosze.pl/userfiles/file/jirijexem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tecnicas+e+instrumentos+de+recoleccion+de+datos+segun+sampieri+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e250.bin
8fd95faeb029020c1ed5ccd3cca1ffcf112c15158cbeac209eed794f894e54b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 5424 bytes
font_01_sfnt_off0000f4ab.bin
506526217e09fcba2a9637b19436edb978b024c1faf51126cfcd76fd9fcc9e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 11872 bytes

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