Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9cee3fbdc98c5d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 18:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1ba22e910b052d1b25d847aa4afea2e SHA-1: 27010ac37832c29e66ea2f2d00fdf8b296648ec3 SHA-256: cb9cee3fbdc98c5ddcb01d46d69bb3eb05ea3dbaa89a5bcee56f7dac3b22c2e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://studiopedrazzini.eu/userfiles/files/82855980511.pdf In PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/94960488252.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wanan.pdfIn PDF document text
    • https://agatanorek.com/files/file/sajowipoposuxip.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e01ae90d057---papipoza.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4a98e47e---51750327863.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b482748accf---zojujosalavimimalowetuloj.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/vugalelovajus.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/duremarowupelonuwuvi.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4c2cbf799a64fc886fbe787b306b608e/70560645907.pdfIn PDF document text
    • http://vtaky.sk/media/file/doroxanonewita.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/26451852198.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1o6eg4bcpjluu9ab4i524s7q1h/bexer.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f29080d7371---foniwizifimopebawijisel.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/nanikineruwewevobumuraka.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/toretixesigoworofodulevi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5ca778a45471549dabf39fa998010753/wejadowiniruzefa.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/af624c4c34632c2c2473ea8985d0ae05/34822939515.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3516775665.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/towupubakejoka.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/safutujufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=change+paper+size+printing+pdfPDF 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_off0000c20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 18120 bytes
SHA-256: 2c0cba01184b740c8ff02e75c70cd16835c4871f1d0e215ba2e972e0276da164
font_02_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 10704 bytes
SHA-256: dac3cb67eff68a1eeb6b13ecafc80c91cc7ea976ed6abd8da7a7dcd960ff601d

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