Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb290ec2fe686bf…

MALICIOUS

PDF

67.1 KB Created: 2021-06-07 00:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bffb9dc02b01bd50d03f405170b67352 SHA-1: 7eed12d221ba45b84cc9319d49adc8fe8492124b SHA-256: 5cb290ec2fe686bf03d2bf34223791fe8742d7b594103d393cc32f2e760545c6
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, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or redirector to phishing or malware distribution sites. The presence of external URIs and link farm heuristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=120+dias+de+sodoma+espa%25C3%25B1ol+latino+online
    • http://bajcsidavidfoto.com/_user/file/54326770333.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160925f4604cd1---pusulokifowibuji.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7d297c91---75524160191.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82543a4f9e---lexuserawuxalupapesisosi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789271562ae---36668044214.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c1dbaddb9---tepoxatovenuveterizol.pdf
    • http://flatadministration.com/uploades/fckeditorfile/99586147909.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608800a335351---fewunewigugu.pdf
    • https://webmenuplus.com/images/file/31287828537.pdf
    • http://akcjonariusz.com/UserFiles/file/77301287736.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e34b167e0---27864124048.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c48143ee7d7b8506d436d558e5682179/xidukupugu.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4600c54b0df14f6c15b84012632c6e2c/defeselogu.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/20dc58bad20b38180549bb98c6addd9b/16953391107.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8o9upajbj4cumq8jcmq41b3d1/jaferivepuxatuj.pdf
    • https://cncostruzioni.com/userfiles/file/zifegi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ffd025d146dcee1f81a7599d26cac46b/redadasalixiwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9b.bin
9b47a77e01cf902214fc40899ab3a293308938e9c5782008dcd4b6e850b1bcf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 5452 bytes
font_01_sfnt_off0000edd2.bin
d36304bb4ec0622fcc1be49aaf825e7368376df4dfb28b0cfaf994a15da9cf54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 10980 bytes

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