Malicious PDF — malware analysis report

Static analysis result for SHA-256 053807b26d97bc58…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 02:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 194a4e208e413c2b94aa893244e7abd7 SHA-1: 905eb186b5d1a15f23f2c45380f96b95d894b05c SHA-256: 053807b26d97bc58137f8ed43b9e8f7b7d331d779c14ea7f8191193c0cde2e3b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, and heuristics indicate it functions as a link farm. Numerous URLs are embedded, pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3586

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://nomylo.ru/uplcv?utm_term=aplikasi+edit+video+tanpa+watermark+laptop
    • http://msiutilities.biz/documents/67610654024.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/marudodameladuwise.pdf
    • http://studiorinaldibedin.eu/userfiles/files/netok.pdf
    • https://krzczonowice.pl/gfx/file/41027813331.pdf
    • https://granitabrasive.com/editor_up/51073118902.pdf
    • https://ozora.schaffsen.com/contents/file/tibogodi.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614763b3c1566---lotugukubobowa.pdf
    • https://omegaplus.bg/uploads/pages/files/danodepupen.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/66537976056.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/titixilelosobogag.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/29199331345.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ffd53a4d6900676c5dcd8ab4ed33cd67/sefesavodezeleveg.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/59607465061.pdf
    • https://coastalstudio.com/images/main/file/ramukipewumaxunen.pdf
    • http://hycxchina.com/filespath/files/20210903224916.pdf
    • http://musicincw.com/fckeditor/userfiles/image/tojunofagevejega.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/dofejabupevopodujojeb.pdf
    • http://damosushipleasanthill.com/uploads/files/70804825267.pdf
    • https://mptradingcompany.com/userfiles/file/26811097122.pdf
    • https://fotofidelity.cz/userfiles/file/33402675157.pdf
    • https://ctsgroups.asia/images/file/86903743584.pdf
    • http://identik.hu/editor_up/felijukat.pdf
    • http://seattledesis.com/fckeditor/file/87597203707.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/1734915649.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/44423636282.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cb58839c5---95250549201.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 16792 bytes
font_01_sfnt_off000105ee.bin
58372e8ca3fa2ef9a178a856277fa4fc0ed4041fa5e51fc5fb774eea9834dbce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10780 bytes

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