Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d00b220af7fbc9…

MALICIOUS

PDF

95.0 KB Created: 2021-08-29 10:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc458814c35cdb8a5aae1708c2d3d39e SHA-1: 8eebb28e4d3228a2e3c3dd5aa516c5d6e15dfa25 SHA-256: f1d00b220af7fbc965f0e021dad547c81a2dc3c2baa35a6888392025f215901b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users into clicking through to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://stlukesmn.org/clients/17773/File/kuxanuluwezoteravazenivo.pdf In PDF document text
    • https://eslms.com/userfiles/file/96648360642.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/xuselod.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/68855246545.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/67959400005.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/kerapasopo.pdfIn PDF document text
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/jibeludum.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e721e25d56---38595871570.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/98741540386.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c418361595b---niledomevem.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160962566110be---73504503416.pdfIn PDF document text
    • http://capital96.com/userfiles/file/37166375569.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bef8578c3f---gomuwaxegumik.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/28549694715.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/38000690107.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4fb6c2b17c898ca28157bff137842466/zogiwonulojagureweraniba.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/20730051220.pdfIn PDF document text
    • http://njchemland.com/upload/files/95785418413.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/24452908361.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/57365074640.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/n7n50rmg6etn2mk62deqa6339l/58990726824.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2520974448b6f82e6f1f2b3d23a7428c/pewiwatuvajoxobumiwevez.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/61160997822.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/81568351939.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/nelonadeliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=washington+state+odometer+disclosure+formPDF 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_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 11016 bytes
SHA-256: 3e936d9e6532a2d4344ab768920813731bb0693f53bb595148866cfda2da4f46
font_01_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 17992 bytes
SHA-256: 9592bf3b0194381e58abd206ad8a24286cb3b5daa8dc43958eee12b6e53dc6b4
font_02_sfnt_off00015530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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