Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf453693687fedf3…

MALICIOUS

PDF

82.1 KB Created: 2021-07-13 02:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9c356f6e65bdbfeb5b279974af3178a SHA-1: 3a661e558b9f2b301a7ffc36777a1bbf9d57fb4a SHA-256: bf453693687fedf352d144d97214fbaa965c8f765dd01f0ab60c24c91aec02a3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://equator-maritime.com/userfiles/file/molukofe.pdf In PDF document text
    • http://francescofesta.it/userfiles/files/ramepufunajagewo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/073fdaaa15243db732644bdd8f253ee9/javepexew.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26592386966.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/13795980534.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c894d5b23b7---57278619127.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/73709708665.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/jidewiwowuwavap.pdfIn PDF document text
    • http://ubest.ru/images/file/dumuvoravosomedisoradosa.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/221b93e7fc2b6544ffbcf66dc64b4ac2/14589257704.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160855cb8c89e5---62254339065.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160707f0f10243---62100438644.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/g6g82rkc482fk0g18spv5fkgc9/kebeduzazenekifujaze.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/97203405576.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/80694922869.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1f2100262161dd0e8504ac60446a2d09/vurumixolawalezogibuxos.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfe7f587f6---rikusiruvogirujepani.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/koseneronalefulafa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416fe2c37c---bazexapezirof.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/dozir.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/1f5eaa39c76f1360a173b67e3a14ff5a/lafolepemegizamunemake.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff64084ad9---vedijakob.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/guginurilorixevu.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/dufisapopulep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=excel+project+work+pdfPDF link annotation
    • http://www.bloomberg.com/video/sulon-s-cortex-headset-bringIn 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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 10480 bytes
SHA-256: 5a46c2565876d534879233b9284974f90458f314f6f532fb349ba628b9417207
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 17048 bytes
SHA-256: a497e84e7f50e940184ac97a758a51eb49c54c99c712998d5f24973021b5af82
font_02_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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