Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb450db64d555a29…

MALICIOUS

PDF

78.0 KB Created: 2021-08-27 02:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8123c620f1837a17c92950a49aee2ff4 SHA-1: ddb31c621670cfb2ce84a1059d39f3412f973a8c SHA-256: cb450db64d555a290935cab530bd89eea1ca575662af00957482da5deef35c95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://creativetechno.in/userfiles/file/93849563287.pdf
    • http://creative-format.com/upload/editor/files/481464033.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d236d60e---89389559231.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070312f005d4---69211372621.pdf
    • http://arsvet.ru/img/upload/44985020720.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d6291bf95---domosilulilo.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/13726528655.pdf
    • https://accounting789.com/ThImg/file/51827596239.pdf
    • http://mistralizmiryonetim.com/uploads/file/jisozoti.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff3f14464---64597244969.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea68ecb00---86227895030.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc29a75f8---vupesixubidajadijajo.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/26931413794.pdf
    • http://mkngsp.ru/upload/files/nemovepipojileporomijo.pdf
    • http://doingthing.com/downloads/blog/geust/files/gejijaregajeb.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/774af533750c2061a7d2eff8c2c6345f/ramalefafas.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/fb7684b84f83751a4f3384258712440a/rupozazotok.pdf
    • http://originalcheck.it/public/img_admin/file///bodejipakef.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f5423b80---14434447207.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf6b8a46a---jezenudibirezov.pdf
    • http://halaljones.com/uploads/files/2304429320.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/jewab.pdf
    • https://nmcs.ca/userfiles/files/13589482257.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=david+anders+the+revenant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 16792 bytes
font_01_sfnt_off0000e73b.bin
871b2aea3dfe95ea7482d635f2ed8ce9732240453ab906b6bbc28ed157c054ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 10244 bytes
font_02_sfnt_off0000fe34.bin
217d3b09155bac84e0f54af112bfadce816677518eef69198e1a18a2a8c86854
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 17216 bytes