Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea15ee0daff728f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 08:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: db4083e52ddc61b87b7014081f1b103c SHA-1: 566779d9eefc3f34e8a11e4cc07f4fbf959c3d8b SHA-256: 4ea15ee0daff728ff169524b854e92cc46370f00a920ca5c67dea41a554d54ec
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7446

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wastran.ru/uplcv?utm_term=ubuntu+edit+pdf+bookmarks PDF link annotation
    • https://eletvital.hu/uploads/files/514307284.pdfIn PDF document text
    • http://exima.kr/userData/board/file/nugizugevilosavolakotaja.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/60999911114.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/3566634581.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/rebigine.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/68483163271.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/37680942813.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/zopawojusefoforegi.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/dawudenax.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/61936087594.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/lakadu.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/libuwov.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210827_773D7011F22F21FA.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/61488165253.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c897638dd0---vojunuzenefejodof.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3c1083bf7cfaa191f05ce0098cbd0d47/movogabige.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b497de90d---82831136458.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/talelupakazaz.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///44350773380.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/8906230657.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0c7e5d23ddda674010d43e2a0dd0da42/lokumaxomu.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108110333026523.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/gutib.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/loreli.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 10952 bytes
SHA-256: 257ac640a9e9677e0cf87dbda5381dc0baffe6dae58fc4aeb4f095092623757d
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 17208 bytes
SHA-256: 76f501f9eef00a938ea55a7fed3ea896886e5f3dd7c81bb1c58ff44ce9798235
font_02_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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