Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d22510a5f9cbcc3…

MALICIOUS

PDF

143.5 KB Created: 2021-06-17 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 266bb2eab0b460d2d6eb9e927ee8dc78 SHA-1: 6c3a7dd8c2ccd7bee9600b4b6f166aa6289c590e SHA-256: 7d22510a5f9cbcc3784628738ab4c2b19dde084a4eda10c7a0451ee1be4c22b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8b17grh3l80f1c6316h5bc16h7/panetemixataz.pdf In PDF document text
    • https://et-auditing.com/userfiles/files/51087991663.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160abb870626d9---labinazalof.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/37d2f36d86e44d02f7a5284dcd971c70/vusisefusabuvalakak.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077eabea3094---46502041110.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/kujisexumebozagukuzuramib.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fcd7226b1---82736123611.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vmabk0776q0vv36frbrg5pop72/82739726837.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/30777667517.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/35186642047.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zolodilotalejixotakuti.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052206481573499.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tunapebe.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c4e58544b8c8c07e893839a2acb9d198/13823715550.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12129f335d---gajekisotodazixujo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf1893fbf---96056368885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=diablo+3+switch+player+countPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1E4 6716 bytes
SHA-256: be7d32c4a8cb31a19d99dfdea5b9d0137d45ffe9aa8da702a5279bd2299a7e5f
font_01_sfnt_off0001d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D89B 5400 bytes
SHA-256: 45a0328f7506e59d86b6409e9bb8f51bec5e65a8aeb6e91e7802000373e11bf4
font_02_sfnt_off0001eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAF1 2140 bytes
SHA-256: 49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594
font_03_sfnt_off0001f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4CB 13436 bytes
SHA-256: 583d7bb8f3684ac81cb8a7198943c7aebfec35f77e2f0d8e8245df6a45c03401
font_04_sfnt_off00022106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22106 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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