Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c036193715dce1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 23:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e523c701743009ed8d43ad24fa32f61c SHA-1: 6959bd356b43d86a98ca9e8d49992dcea948c8be SHA-256: c0c036193715dce11bd05a2818c07f0a45821d451ebf2532eef79ef012608e37
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm heuristic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd24331b4---xuvoxoxatenunagalapomozis.pdf In PDF document text
    • http://hanart21.com/files/userfiles/file/37466609046.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tidokanaxinalizomo.pdfIn PDF document text
    • http://cocoal.com/uploads/file/96992418658.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/kuzamev.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/luragalaralufipibedafize.pdfIn PDF document text
    • https://vendax.ro/files/file/23693030409.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba30655cfba---dejevipokudaje.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160708c81e18a5---fegebodizaludi.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/13510852292.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/11039114516.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/80318180282.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/12897532190.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e4910ffe5307dcc52b9bfc4e96332c5f/38277901339.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zazugezizixo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/946c383d7895e5a65f29c0bfb23702a7/sawapinawugelatugo.pdfIn PDF document text
    • https://sunrisepool.net/userfiles/file/xojijebo.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/26655771966.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/bosekisizubowuwapafubama.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/34249357124.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9af7451df6---73797740484.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c5e4a60f8ce8856a7cd0d8330fb1a864/kijejazenipevu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2fa5b4d2a4b1a5380947423c56830569/80951043734.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/76f5b7c1277deca2f7f0819c20672731/12531028262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rotary+encoder+omron+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD18 17680 bytes
SHA-256: f10e553e52ab9740fbc29096d01e86a3ea308c29013c14fc18f1cc82cc7c63ab
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10632 bytes
SHA-256: 37c63e4b5a3c1662a18562641302d723f9a0edbd51517b295b71b3f16f3a0759