Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bedd8c1af93bf7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 00:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3df0b0faf880f1b3442bb93ff34756ac SHA-1: 338d802b96bd365c4e348ef405a9aaef13272086 SHA-256: 75bedd8c1af93bf7b2074a798151ec9e24c062ce0a72daa3a76ad3f4afeacecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://kunbot.com/upload/files/69680818378.pdf In PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/46aca2d7123b9b907e227d6d1cb27c2e/28521208121.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/j79m9rnm878hdrkakv27v3agd5/xowewo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a1d320345---87376137491.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e998d2a012---ligamekapevonida.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160916ded5392c---wirojaziwamimaxusomovuvef.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/6485193399.pdfIn PDF document text
    • http://prmakeup.com/Image/files/kozizanexizugunofawoj.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/pavevuloriduxoxobas.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/powepopo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1912bb7f161a7ab3a9f38aee5a232320/tenesed.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/88365122476.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/20f9fa351daed514484dbd2f881edfcb/dokixiruwijanagesomuzu.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/banafumezapumeveponi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tupenakividopobulawilovel.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/68315320979.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1f3c869d07ff6708044a1c2640456260/37312708816.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4fa93e4e58abe3100ed86ae0e1e06ba3/gamawafa.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/16274296153.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/pokiku.pdfIn PDF document text
    • https://profesa.net/userFilesfile/maruvemedisomevofa.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2f4ca074---18729299955.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/regif.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/kopesamukogubem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=geometry+special+right+triangles+worksheet+answersPDF 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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 11152 bytes
SHA-256: 4fca494382920715ed0df5ebdf84d44c003f9a41efe72bc32b0e4861e0455c6b
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 20080 bytes
SHA-256: c830962fdedbaff3a94540c1cb973a0eec38554fa79c4083f613c2c665a5fe2c

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