Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d78430e3a38abf…

MALICIOUS

PDF

83.3 KB Created: 2021-08-28 12:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 302d658ce0d68df01b84f75bdc6f4ad9 SHA-1: 85bbb0361844e97d20f89dc72423440c84488479 SHA-256: f8d78430e3a38abfffcc27982ca190ec833d4a28de9cbe14a8de76191fe008c1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing embedded JavaScript. It functions as a link farm, directing users to multiple disposable domains and compromised CMS uploads, likely to facilitate the download of a second-stage payload. The presence of embedded JavaScript indicates an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nisahanpin.com/calisma2/files/uploads/xexibubopumewiniva.pdf In PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0967e9d116369fa574e1d263f1a39cd7/14971861263.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/46859507236.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/84352123830.pdfIn PDF document text
    • https://magerp.org/upload/files/56063765613.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pemujonitobodug.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/pr7da8qemnne5qs7sneu12ane3/42751743598.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161095ee3615e6---95993839694.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/mesibolu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d737764e---buferefipukajez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734b56e7d1d---xubodopiguvozuv.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e2e9c8ac---tidokusaboxe.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/xepajoluwuzudusoko.pdfIn PDF document text
    • http://lawina-radom.pl/files/file/xomiratevurutirodije.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/43130104875.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de9bc935542---repuwebozapetaxajam.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61107CFCD158D.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d3e357a513b507ce0618c0afcbc85f22/rujidonifof.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4708210ae---48583850538.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/wisumurujo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb76b0f5e---zedidogavikavemiretalopi.pdfIn PDF document text
    • https://kede.org/userfiles/file/68188019142.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19feb3b8be---39108771275.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/vovilileduwezivonijedasud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=solution+manual+for+network+analysis+by+van+valkenburgPDF 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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 11228 bytes
SHA-256: b79d09113c39ad9e2eda1c8076d6dd367309a69f84a49a6f2e90f6c14778d3f4
font_02_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 18500 bytes
SHA-256: ee6ae0b22964478777e2a408676ec0f7976b58f99c5c6fda235c0383e383dabf

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