Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b14b7c54c34f14…

MALICIOUS

PDF

63.7 KB Created: 2021-07-31 14:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8373277721ad8746e56ab4dfe6551ac5 SHA-1: 687148b716dc77e109c5001c836125048b35a797 SHA-256: 21b14b7c54c34f143355d279ce24b73943925310cd26d345d404a750f980e618
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, leveraging the compromised sites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7599

Heuristics 5

  • 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
  • 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://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/10aea01803f240e9c3cb7a5522805965/93742857916.pdf In PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f86c04632a70a87237721759e72dbeb1/13653550171.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81bde0a893---xodujugate.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/diburulav.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/12499345481.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c79f14abf9---27218088539.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/kraqnt9ut7d6qjmbmk9hu17qd6/46042112803.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/58386895090.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/19846482782.pdfIn PDF document text
    • http://iltorg.ru/upload/file/voranegenegurufixabavab.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/64754473648.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/revigapida.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2449f56226---42429234975.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7c5fbabd4291030d6c3f2a00b1be20db/92016209949.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/novakexakonuzom.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9cd96b83---tadagotowivemegak.pdfIn PDF document text
    • https://plasy.com/uploads/file/30623278112.pdfIn PDF document text
    • http://redactron.com/userfiles/file/gewixike.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/95399600221.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nubivababubik.pdfIn PDF document text
    • http://vitrine-prof.com/files/83191706451.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/4040426342.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-14/20210614080324199608.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e97e8656c544e51d25bca29a543e711c/99074369466.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0aa79bfec---75678390604.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad19b974a1a---wosajasiduf.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648b7f011c---78761400782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=environmental+econometrics+using+stata+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1