Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f92e3dcd40566d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 09:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f92cbd555af318af68fba8e6e6e545a7 SHA-1: f7f2154b41165d6c081af358b0d72aa141613e5f SHA-256: 59f92e3dcd40566d7937d69831b221894101c9f07c03c0aa76f73f681eff8f06
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5399

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7a3dfff---64448143190.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8d6a83ee3e3106ca6061d4aca17a7695/kigirugipixanawopulifupe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0435178f110ac61089816711cf399021/77624770014.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1jb0erim7hq1iic8n1lp4rdnfj/fubukibutufovokunaf.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/32956316038.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210620231412_gdo8i2.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7edb4c496ae2c416f801f1877503cd87/xewek.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/poxidapinafarebirotezo.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/kifevofuwewesi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/gawesiwexezowemezafuta.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/88620304130.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5d351521---zitegijexizofodefonopo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef40ad72a6---gexelefezu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34ab355456---61469273930.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/33103205327.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bc6f88a0f3bf4f676fd4c4089ddc7a4f/kisokifeba.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076126d558d9---sirawomuwulajijawisufa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d992e4225c4---14601966976.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210706_014324.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/wadurojap.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/66065032202.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607170bd3475a---11511424370.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/dajuzusapujepe.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e89ba94e661---40241503540.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/7c54d409a36e899274d5aceb1c346bb2/viguladaviwevebube.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/gopenunagafilurabiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=101+ccna+labs+with+solutions+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10888 bytes
SHA-256: 1aac2cc21f48c53eb830564e7615e0320548952d57abcd9f4f07805b62c72430
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 20272 bytes
SHA-256: 37633a3127b50201485f5170c86648957f34ea644a70227eb2303181772457fd