Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd701afd0a387eb…

MALICIOUS

PDF

97.2 KB Created: 2021-08-16 07:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0dec5d35546313c2501a222193e1cc8f SHA-1: adf8d0a1d069a47217ed771c1db4f3a297b83756 SHA-256: ddd701afd0a387eb4fd4961858977f44a0d100392d1fbe3926378b75504604cb
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 0.9953

Heuristics 7

  • 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.
  • 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 http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/berigisefa.pdf In PDF document text
    • http://worldnaturalfood.com/image/upload/File/93051837145.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/biwikovokatek.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e84ff75f826128d6e9573f08ce464552/sezovixonivojuserebiwerut.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/16150359842.pdfIn PDF document text
    • http://aquarell.ro/userfiles/file/zutozetejadizevobawivufal.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6e210815---lowitoxazej.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/limodezomal.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/61326628541.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608719093ba28---xojudevanokigem.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083edea063c4---52684917211.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606defa521c3f---fajevenijokipes.pdfIn PDF document text
    • http://gestmase.com/media/images/file/jedidagadakirowibifojasaj.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0491503001621879225.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/45350710977.pdfIn PDF document text
    • https://music-group-store.com/upload/files/38715134136.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/1852982783.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6f512f3ef3d9de2b770239c71f7eabe1/ruzitakusezikibamelox.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/06942d98b1d873420d56a623d7bb7edc/jazofer.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fb2a7eccc261eaf0ccf01e63452edb82/73639873629.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15d174dbc---32905966535.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/3v41srsrms801a42vtc5e80qn1/bibevunosakopuneweju.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610587d44d4eb---40013271094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=onn+wireless+earphones+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 16928 bytes
SHA-256: 5cf5d604707cd26a27954627538987c36b3799212251fe919bb03845ff421909
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 20188 bytes
SHA-256: 6c44295935caa38f10f9059623dbb3aefc6759fa02a3dfa3021e7e5a2545b5c0
font_02_sfnt_off00013ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE2 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off000144ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D01 10632 bytes
SHA-256: 90b07a36a1c8426d4c182d6659064c6bba1d6d17382af449acebb69f8f5d5517

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