Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c38c3ee0e51317b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 15:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d101e83a09f9d7451cf4005f32a008fd SHA-1: a84137543d9775f12bffa8f74b746447b92cf86f SHA-256: 2c38c3ee0e51317bc04e70a75e77945b39c1b06ce98b44489b20cb7aaee90e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns align with techniques used to redirect users to malicious content.

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://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dajagusozasa.pdf In PDF document text
    • https://sporyolu.com/resimler/files/69765030199.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/58696322703.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/52594169828.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4a767f29---ridakanikuve.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/robegikijutoxaruw.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/23741684723.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/54652339652.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6db04a6f---lanugojazefem.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/40556990550.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/besezexalanewikizedotan.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faace15adf6---vegowujowakifijinax.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4b83c0a1537baf43ec70253e6c61fa15/68862142165.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/perejo.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/rusujewijilosife.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1111a94668---91869198405.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ff9aa53cf0deef8e433aa98c852b4f55/26534348415.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210725191438_24htcg.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/jdou22ift38nrf85t8mb3is34i/fifasamixemufozonagupono.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/12092406551.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/39514535298.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/pixubotavorunomovoxesepik.pdfIn PDF document text
    • http://stromzeleny.cz/file/jureretosuwuteviri.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1c104989e---94648915358.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/zupetejasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=statement+of+shareholders+equity+formatPDF 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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 17128 bytes
SHA-256: a411c40e0613c57c81c37d44a349213c0b3d00db7cfc5127fb6eacd66ecc4a7e
font_01_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 11052 bytes
SHA-256: 4b2bef4cdf59d21b28e499d6597dd11084be012a7a644e4315a4131f86ebbdcc
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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