Malicious PDF — malware analysis report

Static analysis result for SHA-256 b159fb2e8848b6da…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 13:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3390e586da5a56f16d6614ad4ea14bc SHA-1: 4ae1317704d81768b63808c961a7b01d7e1918cf SHA-256: b159fb2e8848b6da9ffd7bf24ebb297dba1ed80c79479af6d0c8d07e00da6093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=p+block+elements+class+11+important+questions+with+answers+pdf PDF link annotation
    • http://reguitti-engineering.it/userfiles/files/72014161904.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/71934386307.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/zigipokurorigiko.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/40440719761.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/40565602096.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/jisalufuxot.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/40666442390.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/557174612250e04f2ac3d971e0e8ceea/rinana.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0382591f5e9aa8fa6fb1026efa3aa634/jupunisenanikegunov.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc14cca0f9---rebokamapeligaminid.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103536aaa6b6---857573211.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b20d3f2c7d---wolupew.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6220308a---83150742321.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/zetuzuratevejojowujawo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed6ea2c0a---kolakikebelozoleko.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba1019513---xodokovagugexa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f675a9946---3031964687.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/46054933847.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/41133874609.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160795dffe214e---21632590603.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16250573851825223677.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/57959395855.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/55226290993.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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 11504 bytes
SHA-256: 853bebc6f9c54a9669770f24cfd0db28593310f2c6bc2789667343ddf9fad5b4
font_02_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 16240 bytes
SHA-256: 8c12faf8cfeade7e30de203e89bea0a63dd155e99a13185ce76516cbf2ae62f8

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