Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca73e255d05821b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 00:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b432f22ca9fa47acba78c387e16a7c16 SHA-1: a85e0612674496e2cfa7935d0720d82c2724bfd0 SHA-256: 6ca73e255d05821b2be9e24516d87f9dfa6f6878306a9defb4fa58e20294ddb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware download pages. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=lambo+car+simulator+mod+apk PDF link annotation
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e1724c5b7f81134849af16f71181ae7d/94263507899.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5e1a34f5166e0f46410659448014d65f/wunabiwitojufagapolumaxe.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/57160521943.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/61410984948.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba0014f38---zojobo.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/93554360441.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/75135280212.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/delivavefenuko.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/12659718845.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/vogetefedisodivomeduvuke.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396d1300c37---pefezu.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/99325629604.pdfIn PDF document text
    • http://abpaluso.com/upload/file/81378591875.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907233133.pdfIn PDF document text
    • http://svx.su/ffile/file/zunis.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/bedel.pdfIn PDF document text
    • http://mestan.by/images/file/rotupepexiboxarulukudaw.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/moguk.pdfIn PDF document text
    • http://hiniceshine.com/upload/48108928512.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/jozirozos.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/korefedoratowodamujip.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/dosabasapexagelimezado.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/romuxorojepiwavobodosov.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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 18644 bytes
SHA-256: 5152d246925338ed751ff66472b5c32a30ae53edcedbc539698e3d2c75a86333
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 10728 bytes
SHA-256: 90a4865049dad89a9e68b3feb893a8790cb960e3cbfce90a23d788bfbe6f3124

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