Malicious PDF — malware analysis report

Static analysis result for SHA-256 5249248fb3c8b849…

MALICIOUS

PDF

85.0 KB Created: 2021-08-06 23:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90d19abca892005493358a329531e9d4 SHA-1: 377407b0a57bf3f75f8959147124a8698527a014 SHA-256: 5249248fb3c8b849cb4ec6e40431a11648446482681074ae70efba5d1f39bd81
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 websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=padi+advanced+open+water+manual+pdf PDF link annotation
    • https://isosklo.cz./uploads/migesatanu.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/96209625654.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/reguse.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945610ee3a---40456449329.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e54fphkjfcgaus4l20ea6ku9a7/masokidinusuzaruruv.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b6041dc642bd0138889aa3db39347771/nobuwuwaz.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/wuzisobulemewij.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb01462a1---86944325699.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vesilelobid.pdfIn PDF document text
    • https://amblamy.ee/upload/file/68991486788.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/99334022799.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/thckq47ssltpo00t2ut3k14g7s/wijarizelat.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/nuzorozutozenoxeriwamilun.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tn60b517uv8v79uiucmk239va4/tunisafije.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b9449f6fb9187d85d6ebb327977bc712/42867309595.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/57003091486.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097b76e390f8---bababogevibitodemivebu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210710104951.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/pebikileduxaxake.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7a0a2ccf---53272506964.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/56576952807.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/81406474286.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/fuzetu.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_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 18072 bytes
SHA-256: 9ea550c04f0fe6f5548fbb040ee4a9628865a42327501ec36139ff95c37c470d
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 10864 bytes
SHA-256: 493f0bff271402d7aa8ef424260a3d8d99de0ab9f3b8a7596cb24254a15be56b
font_02_sfnt_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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