Malicious PDF — malware analysis report

Static analysis result for SHA-256 24660699dd983ebd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 05:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 421638e01b0aab818ff61f4ddd4fdab2 SHA-1: f3afd891ef9c4fd139818a8ea0f02e107017a4e9 SHA-256: 24660699dd983ebd24ed135337cd1da4004698fbc0afcc0c606f23139a4626f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=makalah+fotosintesis+pdf PDF link annotation
    • http://jlsxjy.com/right/UploadFile/file///2021082809181973499.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xuzuro.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/diwojagiludilib.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/kizinigipaziz.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8a46022144b98311e35874545516c2b3/tuzosodotuwonapukufosi.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/82049746301.pdfIn PDF document text
    • https://advik.net/userfiles/file/posejadikanubibikama.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/faseju.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210818/file/16292928606155.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/19/file/20210619_165959_135.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118ec901bd17---jasuxowulikuporol.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f519bbd58b---kolononubomupigewetamida.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/sunikubelo.pdfIn PDF document text
    • http://ccsl.asia/files/48996958050.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/dadafugojokugugazakas.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6245bfc917f8d5f98cadb0ca0f933076/94105477624.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26867704715.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/sigowirilejitoworomam.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/juzok.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b89909785a6---15511412487.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/95e74c1d7c98e38abecc3c66e317086e/62548171872.pdfIn PDF document text
    • http://tabletopad.com/images/file/10916617665.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/75328214865.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/g11v9vongph61p1gis1jfkquv6/zaluxojowune.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096889f4dbf7---degikekaxo.pdfIn PDF document text
    • 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16320 bytes
SHA-256: 8a582c02d194f322cfeb384a70f23e5dc93aad5b2aba08b12f99ab28ba56b1b8
font_02_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 10580 bytes
SHA-256: 944112119f5be73ee873f1f9246f5e885f632f5c9b466c3aa2af09b78a7a91cc

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