Malicious PDF — malware analysis report

Static analysis result for SHA-256 425d0383e4e0dd7f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 08:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fcda005b7577c7a3ca057957858bf7cb SHA-1: 376b86e96581f012cd31d9e3266c40e0e2b734b3 SHA-256: 425d0383e4e0dd7f309665aadf2aaa874dc8a5b893521f7ae920fcb7bb69e1a5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to evade static analysis. While no scripts were directly extracted, the PDF structure and URL patterns suggest a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://eot.mn/uploads/userfiles/files/43462747118.pdf In PDF document text
    • https://energooptima.hu/upload/File/nuzuzupibonajapes.pdfIn PDF document text
    • http://scro.ru/pic/file/10858947682.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/lanadilolevefekosojolezip.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/tikaka.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/90073337886.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05915fb3d5119e6d0fa46c59edc5084d/25302447311.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/dugibovukogevurukisi.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/lerulokufot.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae244002e---83245191780.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/rusokevabi.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/21073007575923275539vmnhdoaxg9.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caaac38232---renud.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54db0da36---78300051776.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0763d5cf---29763384500.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202108172332461436.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/53561958077.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gt4ufskv3ntos7vjm4bi5r8fk2/94203959716.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/43279316464.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a649eb72c---44472902387.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/16772543659.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/87534311785.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/mavowa.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/66473242791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mapa+de+mexico+sin+nombre+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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 19372 bytes
SHA-256: f35141abfec88be9133727c7e2cd03c628f862e98aac3a88559b2f017d3360d4
font_02_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 10872 bytes
SHA-256: 85ca3791df0544980eb9f01e562a9bfb5ce588ac491b4c82251b9c509c8d9dbf

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