Malicious PDF — malware analysis report

Static analysis result for SHA-256 72609100eb1cf285…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 01:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bd528201167a4356b36abc31474dcfd SHA-1: 06279e177729c4b9b2588fa97844f0097cc20fa7 SHA-256: 72609100eb1cf285e3f6b55e523634b8b05f2118495ecefc5506faf3070b825c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external links suggests an attempt to redirect the user to a malicious site, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=role+of+sebi+in+primary+and+secondary+market+pdf PDF link annotation
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3813f6bf---kogirasojotijetetazu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bupuxuru.pdfIn PDF document text
    • https://empresa-venta.hr/files/66970748192.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/48512288623.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b2be96bc4---wanidutewuxofes.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/67203077691.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/82519361446.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/kuganowusevan.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/vefavesomenopukafokivebiv.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/38711845846.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/sujowenogamotobuvije.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lututuladowew.pdfIn PDF document text
    • https://clinicscrm.com/img/files/gijuwizedavirom.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/wezavajuxebi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/jijelidad.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/92925277723.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/zagemax.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/22966450141.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/9314915692.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/nejibetutizabu.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/zifukovusizesijawediku.pdfIn PDF document text
    • http://julianina.de/upload/file/negadabiriragifusu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8ruadfmkr6mh51id008d2vkrvs/8651984460.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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 11172 bytes
SHA-256: f4b3a99cfe84da172b3923000df567a916905c6ea27fd9b75ea2a65a85dc9416
font_01_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 17420 bytes
SHA-256: 550b94bba79803663991cc7cfb1b242630a55f2b400798e8f676b1c14e9171e0
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1