Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec5158dfd027559…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 15:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eedd2a77d419ac78204d76ccef022360 SHA-1: 3b69b7e96160bea065b095e2984c16f7b7fa3a42 SHA-256: 0ec5158dfd027559f0a2f88f4cc9a7fbda5fc1b87b597a5a69abc24ee4bf05d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure as a link farm on potentially compromised infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=brave+new+world+pdf+chapter+15 PDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9d05a11a---58085415249.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/20611470939.pdfIn PDF document text
    • http://geoman.cz/data/file/28041644656.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/nozetanitu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/18268487518.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/tujurexawog.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e203914417---ferojuvugimop.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612732f46629e---46271308130.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/85c767b070ef5762557b13103d5595d3/40240180453.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/gejabi.pdfIn PDF document text
    • http://renovator.cz/files/file/luxukivolipowatabagike.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qd6j8k78l412h7gadrl3igeb14/51791301321.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4uu95hhrll3sl1c05prh8cs836/gelufusapakipafof.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160726d4cc5dd4---fapaver.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/xetarevejepu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f7234aad---96001684784.pdfIn PDF document text
    • http://cycling-software.com/files/file/biwen.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/6861b5860f72a39ebbccb064f9830e39/botakumunadexujagutineso.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/14069067445.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/20464094799.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/26723790965.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_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 10848 bytes
SHA-256: 30a7bb4cd1bf9899efca718f8d173bdcf241f63960cdce7b46b8a079dcbd109c
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16568 bytes
SHA-256: aea4f03d36a6ed8fdbd7ed6ab59a3a8488b58844170a573532ec5793a0c2b878
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1