Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c969c3a3545eb47…

MALICIOUS

PDF

87.1 KB Created: 2021-07-30 00:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 613d1df572999fe11ebc3331b6f40285 SHA-1: 03a406b992bfb107afa9afd9d6b86e0f6bb2b4f1 SHA-256: 6c969c3a3545eb474571f3b3c4e246ab7cfcb7b6a5a4f514e79fc7d38909ba7a
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for distributing malware or conducting phishing attacks. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this assessment. No scripts were extracted, but the document's structure and embedded URLs are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fbf786124cfeb4e245313d253a2c3880/69736484757.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/27749571603.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/aumm8loq98doj0gcs090srcef1/fowuxedugelorokebof.pdf
    • https://szabobuszrendeles.hu/files/files/81521089719.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/prvvh4up8bufpsf9pq02phubr4/zipetiburisusixizonev.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90088330670.pdf
    • http://caratow.nl/userfiles/file/bikup.pdf
    • http://constantcontinuity.com/membership/data//files/zexefebitimilo.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/60910a8192d5acc0b7c68e174eec731c/82761843951.pdf
    • http://hodori247.com/uploads/files/96217795677.pdf
    • http://svatba-emi.com/uploads/pages/files/75546799878.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/996873065.pdf
    • http://bpabv.nl/uploadfiles/file/45689041762.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/durilemunovasa.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbce2b41147---xipegoz.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b426e1574a7---lofebiz.pdf
    • https://supermagnum-bg.com/userfiles/file/miwajesakidativamusogepe.pdf
    • https://bodegoncriollo.com/userfiles/file/15355768267.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e19d1cd4a---79922488665.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ac9e6e880d2858dcfea424d1cef9767a/23112585130.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa266301f1---gajegurewubixer.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096de313c8bf---lezatopuxofovatasovozaj.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f2651d422b0d403b4580b1c64c47b216/46567981866.pdf
    • http://rafaelstore.ru/upload/files/vubinosejipo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=character+description+words+pdf
    • 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_off0000f320.bin
a2260952137eb73b99cc3af11446ef35fbedd6e98e3ee63166f18f33af908b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 16560 bytes
font_01_sfnt_off00011df1.bin
d4ba39b812a54219f5d349f82fae5fd8bb84230ab082bb02fb939447837c14d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 10788 bytes
font_02_sfnt_off000136dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 16792 bytes