Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e11d67b493bd6f5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8d39e7cc4fde270bc11d8d1d96b5378 SHA-1: 539e51830d35f31ebcc53fca909b894c4a011d51 SHA-256: 3e11d67b493bd6f5879a815e2d609c718a35eb90c324ce557ccfbc943cf68d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be redirecting users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://irlanc.ru/uplcv?utm_term=android+searchview+back+button+color PDF link annotation
    • http://vuoncotichdep.com/upload/files/redusekaxejadex.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6130aa7d59df5.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/89717823836.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/51607762243.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387dc92861a---kulasijikefikesabamub.pdfIn PDF document text
    • http://shopabrang.com/images/files/gotapusufusomuvoduzib.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210910_6A48E2012871FE58.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/44fef611b9f29e7779453a1722255996/gutegivivagoli.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23631786987.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/dowik.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/16608764337.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/nuzogasugepewozodit.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/17627700031.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eae7d0508---8472051098.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zinutax.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/78679441496.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/56eb1cb7753cd0606d37fa44baf4d6d4/14959154385.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/niwezemudovewizoxiluvo.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36331000002.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/sorelowakajomubajevob.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/dovifetunup.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145552323df7---vabunanowuzegoxitoja.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140bffaadd55---63103031468.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/sekirenugedo.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/rajepexotaxe.pdfIn PDF document text
    • http://beiks.info/public/file/31542080413.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_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 10932 bytes
SHA-256: 578355496fd2f47e817470151722ecf3739b2b5bb7b1ccdac17d106f0f672451
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 16800 bytes
SHA-256: c6c4c09fff097fce4496b7eac31f4b1198b35d5910f2a2469b508b8fe022a78b

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