Malicious PDF — malware analysis report

Static analysis result for SHA-256 d008b3c328a1817f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 17:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f366f0c28b69efd6c24e5db4f66c8c SHA-1: e8d816e488b5ef560df9c40d52d8c51779a3ae5a SHA-256: d008b3c328a1817fe2d8341425366ba13eca91e2ff61bcc8d65fa1dfb78a1a4e
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress upload storage. The presence of a visual download button lure, combined with the ML classifier flagging this PDF as malicious, indicates an attempt to trick the user into downloading a secondary payload. The embedded JavaScript is likely used to facilitate this download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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 http://micruts.org/userfiles/file/39688849499.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3e34d59e---35034155692.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/43649773715.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/regewamudufubefi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2d444b2d981c9942908d22c45d6738eb/wogalepikonaz.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161318875571b4---xifuroxofanukevedagirit.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb24ef1d19---gixodi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371dc991ff6---sixezopopural.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea37277f92---84748933581.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/rigomewipelaketidugirekoj.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/vodepodowagumezonupa.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/papez.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/39559068448.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/87860946930.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/56171068481.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/98558931313.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zirigiraperowa.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109050804381834.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/37743676481.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tagaxavuvekutesoduz.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/74932758757.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/ralixutelowu.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/libakep.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/kirod.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/86088762168.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/96034113827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=elementary+statistics+3rd+edition+navidi+pdf+freePDF 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_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 11116 bytes
SHA-256: 2c5d501fd03d02601fdd40624748a87005378c81943ee4d2deacdec4ccfb2cd2
font_01_sfnt_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16032 bytes
SHA-256: 079bedec929b3f3c2b80f85e6a274a8ca568f95ebf75467884625b50fd0ca20f

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