Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a69f5c334bf25b9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 18:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3b3a42c88492ffa0e68c00f5bd8d443 SHA-1: 699397f333b4285a784c5c0c10df143f8b8233bc SHA-256: 9a69f5c334bf25b9c5955f7baa47d239f30868a354ea2426e7e5aa9f7d41f682
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a spearphishing attachment designed to lure users to malicious sites.

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 https://ketchas.ru/uplcv?utm_term=english+speaking+topics+for+advanced+pdf PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791b26c86---11470913955.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/60782530506.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/bugetomedugomozamegibi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8v5h94h637qu0fd94t7lfcufpt/zonojup.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34433e74b8---18105737066.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4bfb3e6da75f9bf9744d26adbd0cad6f/33399844448.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210724_AE2DD7770EA709CD.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/95954069225.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0398b442ca---vasabamovol.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/90981884597.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/59289627249.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/38348882903.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/21319034845.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/afeeb9d00d0c39b4e04ef9af7acc3559/73639208211.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/porig.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16100c0ab8c7e1---vikexusumulala.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/20958954064.pdfIn PDF document text
    • http://polkovnik.su/upload/file/nuwumunemiwogitudemewamiv.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a77b6462f92b1f661f36c7ec6d239bd5/foniwurexoxagixizapem.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/85152639378.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/46ed8c9aaba39d316c03ae95f4ef679f/sabuve.pdfIn PDF document text
    • https://castel.ro/userfiles/file/2943446317.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf227555563---gosalexevizo.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/xotumazageratib.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 17748 bytes
SHA-256: e27148bd0a3d1251c8bdd0459688338636eb4982262cf449baaf01fdf5086b74
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 11040 bytes
SHA-256: d833e1d8cfb9e90e14370d6c02cf86d2c5d08bfe2a3574905745a750d64f2f4b

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