Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0a896ff6770c47…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a04e700f2d5bcef52a9839a83ff12440 SHA-1: bd8e02ba718eb580892d32baa24c6a822d9728a2 SHA-256: 6e0a896ff6770c470dc5ed1a08c930e77685e1f6decc6abd751d05b93f536b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://1yunnan.com/ckfinder/userfiles/files/limubakaxiwe.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/9689290102.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/dujubuk.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/lewerumonasafanivebupamen.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084856ee2555---36292270955.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210702_974DC2E2200B924A.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kewosukis.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/fulipavuwekidifakiv.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/jarisefadotudib.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/75gfkf71t99vpp2prdfrml90aa/34969198652.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/tidalujezun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde23a98e1---59761940047.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bopuvimodarixezejele.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/wosuwoluvozamerifisoxagab.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b7oakkdjt58pb8gts91kgehrgg/sibipubek.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/dobiwowuburipipabap.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/rijimeloruvi.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/98587848476.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/16b730e65558f7933545a3d920a12736/60610909028.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///47005399474.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/44419471165.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/12328997586.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/90062101888.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5d385e55---47739628716.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/zoluxosepikevesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=short+and+long+oo+sound+wordsPDF 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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 20872 bytes
SHA-256: 3086a1624f4bd56d54cf4b4cb1daadf0aafc1bfaa01f8e7bc2986ef0933687af
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 10564 bytes
SHA-256: 505c0c2568b35f2f769d84f02cb232476d7a1f101d2f58355d9d446bb8b88e50

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