Malicious PDF — malware analysis report

Static analysis result for SHA-256 818f5ddf67977fd9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 19:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f67f8a897dab64d8d830f2a4ef2b213a SHA-1: cb6f4f2ff00bc81045f0d5380d744ea9fe9b5a3b SHA-256: 818f5ddf67977fd9623b2be5b0a8395af1aeb040d3291663b8175121b9d1799d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised CMS upload locations that host further PDF files. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to distribute malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hindel-relax.ch/ckfinder/userfiles/files/88973780937.pdf In PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bessvilu3vichiereqnamlucc0/lapesipudetepe.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/67638583740.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02af620cf8---nukokekotavu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02fa7d5a3---figatadifam.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/61e394828548b9ad970d9aecde7b2e3a/66805125853.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/dbff442883887a97ef1d7933a6200bd6/87995786927.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/sepopukiwu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/36b0798e8ac825a166f77c3aea9e6079/91758283997.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075803807198---63484882000.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/43904941946.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/8198298383.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086a06fbca04---nusunadizoman.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zuxetedirijuj.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8010c5a68a1035ec0e98548d3d288301/katukanoxo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1773c075660e869cd6868d90fb632cfe/29308167694.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/sanukoso.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7656f12ba---81508465938.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1056ea918---funadarirowe.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/66452337279.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/85207246027.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/fomib.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/60c5f3877c61a3da0d47e5c33a2e32e3/92451319424.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/47096387362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=optical+illusions+pictures+pdf+free+downloadPDF 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 10824 bytes
SHA-256: 16b19d11cf44c9ba9b2c79b6c338f6cb8e37322b5eabca335435d376de12bae1
font_01_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 18700 bytes
SHA-256: 958b730fd136aeba88b3f5acd9df449c1b2b3bd0199d0d01f434045e2e1a99b5
font_02_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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