Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a24915a88385e59…

MALICIOUS

PDF

253.7 KB Created: 2021-06-25 15:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55c85e9fe1e39fc9134ff4b5ba94ed9e SHA-1: 95dff41133a90b6fd4a31c42948386e5c123c53a SHA-256: 0a24915a88385e59b0d02470c74858a88797a92ef7912469ef16ee3bd18091c8
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the sample attempts to leverage compromised WordPress sites for hosting its payload. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious document designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://renault-service.com/userfiles/fepepomusajidewobunopa.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1453537cbb---lavokadeg.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/60pvfe369q8r8bg6jotm1dsdh0/61356658477.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076001c5acdc---54025267309.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ff9c829b3949be195e7c48d68f1253cf/67242510361.pdf
    • http://dichvuwebsites.com/media/ftp/file/zaxakazexokogiriva.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210601140810392561hi3w0h.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c316cb24---67101567487.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bddcfd02ca9---76187374391.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce75248af---65535047841.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/64q4snmrqpqp9kk7csd0608s13/4004549657.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af36e371587---fulimiv.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d697915773---devole.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010ba489d7---jukowabarot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=all+in+one+homoeopathic+materia+medica+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036920.bin
07662a404776d59837dae226a16df379cf2124e28cb0fc2f4ef813faadb640b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36920 27680 bytes
font_01_sfnt_off0003ae70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3AE70 16792 bytes
font_02_sfnt_off0003c67d.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C67D 1700 bytes
font_03_sfnt_off0003ce95.bin
3ed6d65ad3484a6812e2940d2d977efb52481c1003554765cae3f2a94d3d4361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3CE95 10696 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.