Malicious PDF — malware analysis report

Static analysis result for SHA-256 1229a8793fb6517f…

MALICIOUS

PDF

84.6 KB Created: 2021-08-10 12:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0ddc57b4c6e4f489afca0d2977b6a422 SHA-1: db216f5a71f1737ad5f39de9026273936410731c SHA-256: 1229a8793fb6517fcd807600b2726e3676615c0a59d5c6c4b6be21504fadb64a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=picsart+png+background+hd+images+download PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/be38cda536a14ec5b97a58d1390a1547/tefaforunuguze.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0203c718e---jumeb.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b353228158---64325929904.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad032b1e2---wizifelijibokosezepowavi.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ed3256701472e2a036d0b0a78246464d/99622052877.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6dc69f0c2719c445a1611e02c81ecdd7/75120640091.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/ligakubafanofibu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a5fdd99b9f1cdeb6f8eb11dadbe78e54/mineditelajij.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbb0e5d77---37076449935.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ae043135---jewurubekolowozo.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/medikev.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/menewuxafivivuxufedu.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sezipon.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/domadofel.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/92611078088.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/tdcnnpkg4u6djqah7b1474gm7c/besovarutanaxazakomufol.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/38784820741.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e3d8418c---nimusoxaxoju.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/rinavuzatozo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce66c64794---49883205100.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/6sgkvlgajk58hh6plevvr0b3qc/dotuvigabaxavezusu.pdfIn PDF document text
    • https://badoza.net/userfiles/file/42260041242.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2e3170b3123fc93f8d532396f8e9d01d/12746159791.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b67ddf50---86762790416.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5bf4f3ca6---punipesesoluseno.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/saq6oos7vqg0lkf3tqauurfgk6/kofok.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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 15964 bytes
SHA-256: 5c0736e9484fa1c8c1812c6589fb8389e0c074c4d4cd7fe30289dbd648866b7e
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 11380 bytes
SHA-256: 97592b5cb1387cbac058c7dbb2edd5bcfa4c4a4098d507869027fbfc05ae8749

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