Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4656f3929f94ee1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c1e189102a1fb53b71ada1fca8069eb SHA-1: 7b54778d4fa5456ec3f730973623e43f5502e492 SHA-256: c4656f3929f94ee1e18e9bcad62d7684587abad805e6bcc2344e7595eb8106e6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. This suggests a phishing or redirection attack, aiming to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • 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 http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/matonazuf.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f09d43920cbbc71803d34e03bbabd802/sedafopupodumorexaj.pdf
    • http://o2ashop.com/ckfinder/userfiles/files/motosujiki.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074db877d053---77599749234.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/67ba45cc284f6030022d25963e6cc423/42902430018.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/rezajavavos.pdf
    • http://hoadon-dientu.net/images/files/zuxuwigidekipepek.pdf
    • http://ronaldtan.nl/images/photo/kepuvezetidimorajesibe.pdf
    • https://assistenza-termica.it/file/rulizapixubexoru.pdf
    • http://romanakladatelstvi.cz/userfiles/file/wowateximajitokagu.pdf
    • https://study4student.com/cache/fck_files/file/lukojokemuvojeg.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cmgotn501f2d6kspgtk67d3skd/7566833995.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713919b8d3---mixamivosid.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ac37293c80c7845c275fd162340c1d0d/wotidoxet.pdf
    • http://phuwangnam.com/user_file/file/xizexidifu.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/aacf14fdbcc18391819b1f74ac4ca2ee/28579111521.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/c04f5f1de8a175c63303eec275685f38/83680663890.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5a7c4783---xulebat.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/daa00a36a5a012d156b43cd93e702e66/dedoba.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/ramokezakenunozata.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752ec0e254---xipudena.pdf
    • https://ahreco.com/uploads/news_file/goxazeganusibavowifoxafim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=null+hypothesis+format
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
font_01_sfnt_off00010858.bin
cc8cf7dabc01c6b90a524f5a624e36738607d902ed3fae0802ae72a729bdbccd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16904 bytes
font_02_sfnt_off00013490.bin
b786969f635da03d85eb45e4e9c9b75573a09d38204d96d914e1c2a59b918595
pdf-font-stream PDF embedded font (sfnt) at offset 0x13490 10708 bytes