Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcecf6c58215b89…

MALICIOUS

PDF

80.1 KB Created: 2021-08-25 09:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c91f6488b3c11daf07e1061ae6acc6f SHA-1: 264e7082c7a50cb04abab3b3e45f25a76c6549df SHA-256: 2dcecf6c58215b891487f028dc9b444ba650130adc99f0b8910a133da82c004f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://acrgroup.nl/userfiles/file/60326328009.pdf In PDF document text
    • https://cengilli.com/icerik_images/file/disipubeludesegefovavuzuz.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610073059aea4---rigado.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a8e4d8df---27058516398.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/70759672431.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9cd2ac8b9bf4b2d0ca661b59494fce04/53144264408.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/6697353565.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/031fdd98a776422c545560b3604e10fc/vugowixufavilob.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/sefaxitopoxidepokego.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/vegofamalalep.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813859be748---fawimunimisexegatijof.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1d20883e3---zagukox.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0f1859adbd5d5e7d2e1a865e9760a484/4138380085.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/44919633254.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/83982455256.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/31286608772.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/v17v80he3jomn32i1lmp9kgv0e/57085790468.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/41262433388.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/99915213796.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/242b675a9ca340ca09418694f29ee1e9/posezatolojunivi.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/pemidugugowasiboketo.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/gelazijufumubumemike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=semi+synchronous+learningPDF 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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10868 bytes
SHA-256: d12b859886bb200b2843fc628b3f47192312c67c97ce3d9a6b27a333174fec00
font_02_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16940 bytes
SHA-256: 15427a36713739e0b8c5980a0b3e1981b38ffea4601dec6f2a6ec8cdf2edf4f5

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