Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8af38bb4a93962…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 01:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d19801947667e829ca46e6a8b1dcb28 SHA-1: 0f77c867106fa81980e637deb39ceef4087a0e48 SHA-256: bd8af38bb4a939624b7e400791bb517309f4ba62c0446a4858629dfb7f322d42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://6nergy.fr/6nergy/sites/default/user/file/95375064087.pdf In PDF document text
    • http://pincesorvarshop.hu/editor_up/wetojigemurodazuwilebo.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/jusaxawaxikiji.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfd34ff03---73775009197.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/borewukogopi.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/sebavafinat.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/30825357610.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/negoleseta.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608984ccb1085---bipinen.pdfIn PDF document text
    • https://palet-school.com/files/files/wosazuneminudurar.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/sigiwipokovajisalesimapi.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/jemipagedin.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982646336cc---paxonurezipatelarex.pdfIn PDF document text
    • https://kawanmto.com/contents/files/zewibiripurobajokotusu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/getodovefiwajitogasotoxut.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/98414476000.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/58989147140.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/vokusamojo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29772dbc32---lazebixowipabuzojuzufaxut.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df34e0169---sevabozoxiredubuvuko.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/kopupajovixo.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/37d3b161f31cd94b7664d612da9663fd/83167568899.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7ba9d4d9---dopetulo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161184e0b2262f---fuliwimur.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/39094865294.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/37231426780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=laporan+anatomi+hewan+vertebrata+pdfPDF 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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10800 bytes
SHA-256: fa78b44991f8109ff52acd1ac3cc0a5ddc8ffebed56dbf3b77357c4e48533daa
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 17860 bytes
SHA-256: ff945c11f77b3aeb38a49597626c4a4feb150835878bb8b82705f9535d4ba34d

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