Malicious PDF — malware analysis report

Static analysis result for SHA-256 a670e107ea8ee8fc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 21:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76965d732f760d288ce7dff9834c44d0 SHA-1: 95338d8b31be61745b2762b688ea9245a766ea0b SHA-256: a670e107ea8ee8fc675bae11f0cfb838d76d469cd4d83bff3c79714ab674124a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to potentially compromised WordPress upload storage. The document's structure and numerous external URLs suggest it is designed to lead users to malicious content or downloads, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://baongochoa.com/upload/file/nixufomuwujedud.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6baa7de2---10658256165.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/59469444910.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/70967817984.pdfIn PDF document text
    • http://masonhn.com/d/files/bilopopuvafidexarixowaz.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/80246056539.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/97164751430.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d912dc09c---26008501537.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/57001435432.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/popoxivorenov.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/fiseri.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mkd80jt0ms7ahr5b9umqafbt1g/71004330317.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/93587616502.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f6u92ae2vnbh59clsd5df18fmu/nepiruxasufiw.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nhp1t8sgdgf5dnekma1v0qb9m6/27794608318.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/fokewokagipux.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/26508113555.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/pununuvon.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/250211358692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=circuit+maker+2000+manualPDF 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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 18016 bytes
SHA-256: c0545aad1c055ba0b130061bfbb71fc86b2640f04552318b80c129b46bcb4f93
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 10568 bytes
SHA-256: 11fc37cf24d6d0aa34d8ed8ac8331e0b8a9ca682018efbdc8b17f7762a269256
font_02_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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