Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2a697512b97863…

MALICIOUS

PDF

134.0 KB Created: 2021-08-13 13:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a56313213762a16800e99954f0f8390e SHA-1: 8c3feb0bd93e30858e346d53db56034974195759 SHA-256: 8b2a697512b978633388fc895fb09143d336ca2388351166c3c26f09ea7959bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to execute commands, likely to download and run a secondary payload from one of the numerous embedded URLs. The presence of external URIs and link farms further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://krisoc.ru/uplcv?utm_term=java+swing+cookbook+pdf PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef0e5428a---95283214952.pdfIn PDF document text
    • https://ferropula.hr/files/46648664212.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98371240b---sunijus.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae7a99b18---rexijujifijamux.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/sofafenilarasudese.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeeb43e37d---xalibutufiwev.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf258f937---foparabogukimimunudadewu.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/livogudo.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/86080371265.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbf3d8ff22---tevab.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c341e737---71955183891.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a7b88c535---6227375622.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b57b5e3180e---faxofulegodunugapu.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///nuvilopudumo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/972711203b14baa18b53bf4d2db71c05/31038169418.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/75875579409.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/80660180992.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/diriziguwapumaratopazokad.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/95159660142.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/7024579082.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/30d06a8de1cc97ddf847d67d27324cde/lejujuvuj.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_off0001a96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A96E 18240 bytes
SHA-256: 379b975eea0a71e49cba463f85b44b6f8ed1194a2221e5b4dbfedf6ff11c7a87
font_01_sfnt_off0001da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F219 10792 bytes
SHA-256: acf8ebf4208c0089fadbeb192a89003ec71e30c6ac66d096290699011e7974e7

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