Malicious PDF — malware analysis report

Static analysis result for SHA-256 9895ef03c52151cd…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 14:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0b6abbf71a5802a9f24936f275a7805 SHA-1: f1cd8d260702f04218d763d14d76e88c82adfde6 SHA-256: 9895ef03c52151cdfedf2b9ec6bf97ba055a84de7480cc395b05474aff530fba
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://fitsiluet.cz/data/file/75141827002.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fdc3b314c671334514ed5e22eb816ee5/jekakuzanugunosovipibise.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d39689d927a7aed74c04a0e8e2f99287/vusozipuf.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/jemukizolalokuzelalolok.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd2075dde---nomilavizol.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/46824865719.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc7c672fb2---21966891772.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/lefetefuz.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/61549784957.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618140941195041920.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/wifinojujipis.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/17826173152.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a6144551---vozotujofuz.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rajtacvmtdih5kjvhl60mtpjqu/5392278281.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/66060373927.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/63fba92a9740d154612fc4446a99cdee/27371752796.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/tanibazef.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ac0c0c575ec58e174d799e3cac3b8f05/66593258347.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/10kns77oi850327topfe9mhmtj/kopevovagejisizarega.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/zikabewujata.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/90758913350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=electric+motor+drive+installation+and+troubleshooting+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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 16020 bytes
SHA-256: 833ff04ff2b096b8d7db5207c5f2c95666e2d7b9e401fee0b16a02a3792d312c
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 11356 bytes
SHA-256: 7c56efe53583807020f8daa1aa0c990503db9da19f304d3c71b41109e40b4eba

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