Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9fe51923f50692…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 03:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dcdb26358b35f88cef98dbef32e62923 SHA-1: a555357eb98325d5903eb3c5d61f14022e21d61d SHA-256: ba9fe51923f506921ab3d5ed9f9c28aaf1e56ecbd9f45dc7ee907b7689d22fc5
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings suggest it's part of a campaign to distribute content through these compromised sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://philabc.ru/uplcv?utm_term=best+ad+blocking+browser+android PDF link annotation
    • https://butyfarm.mm520.net/userfiles/files/tegoxopek.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a7b6791e51a8d41b55de9300794e353b/6284086370.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/metelaziluvuzuvibu.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tiwevur.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/95055508081.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/60297805013.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/77099125418.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135469174be0---vepabobusow.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef583c75---36772150586.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/27140282792.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/nipedufa.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/56212847537.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/69095540431.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/53367342003.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/38901735627.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/mitudoxug.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17532762546.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pidavesebivigedevevat.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/xagoxodu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130a591ae065---kedumuji.pdfIn PDF document text
    • http://adice-area.com/pictures/files/titidomazumafot.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/69789900318.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/36880550485.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/kadabogoz.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210901082054.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/lamiwom.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_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 10916 bytes
SHA-256: 2368cc54788a67df47a2f5d0374beed3f6f8b83f6fbc49b6d0216e977742a8a9
font_01_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 17824 bytes
SHA-256: b1c865a9c351843326141ce732f2cf63b39f80160c206d7e70d83030484ce5f0

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