Malicious PDF — malware analysis report

Static analysis result for SHA-256 066efee7366174ad…

MALICIOUS

PDF

83.7 KB Created: 2021-08-06 21:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4b20aa9ab8f31b54b69e8ed94677858a SHA-1: b2de95ed36b071c5d86388dd272c23a2f3822cf8 SHA-256: 066efee7366174ad4f2c937f2435f388d0c9b663cf40ae6a9d96800d18ea1cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://hzbmsj.net/images/upload/File/51976553990.pdf In PDF document text
    • http://banghetretruc.com/media/ftp/file/xuwamepekozadojoxi.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/53792716081.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/25082116370.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/pivovurojo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dadbd5f522---jigubavupikadajiniretexam.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ed1aad71dc12a79509e80a2ad871460e/77727886446.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-18/20210618101825246208.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/e58b3bf043d04ab1ee2dd08f0f775944/64490078416.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/15075225345.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/94359844256.pdfIn PDF document text
    • https://promise-land.com/upload/file/geguposan.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161029629c1951---xubumawofukodob.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/52760021672.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/epq02tqf2imhg463a3kvhqlnb3/vagosurupasa.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/fomulixetakadunikirulevew.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d1dd4235db5abc3322ba46eb73fbfb85/lapuvufikijuvabotikifo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c92edd7562d---69053012928.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff7922771---60782439690.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4055857be3593bfec4ec32ba72f48f4c/gumukaraxidani.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/25768362395.pdfIn PDF document text
    • http://cmtsport.com/pliki/zurofolekazaxekuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=american+english+file+pdf+freePDF 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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10828 bytes
SHA-256: 85e984d8e78e012aad71ec40865fd0301009ca20e763a93677f87b280e62a052
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 22680 bytes
SHA-256: 4647cf1859f9d49a930f44f2e9728a91dfafc86f08b515c28778c0c3b9f5aa63
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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