Malicious PDF — malware analysis report

Static analysis result for SHA-256 4823d12e9d3879fa…

MALICIOUS

PDF

85.0 KB Created: 2021-07-22 08:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 615b029ab437c8a6cb0dba0ce8e44c14 SHA-1: e7d369061715b14e248af3d6309c75cf59a08d1e SHA-256: 4823d12e9d3879fa1633319af468225d61b608e32ddb0d740e32395591462b23
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The sample's structure and URL patterns align with common tactics for distributing malicious content via seemingly legitimate but compromised web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/krl6c2oko15o47fvp90orph4nu/1516314979.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/tepuli.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f0k6c7shgvarrkjk9e69tr6bau/bexizapojimemafefisebex.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a706548c185095e29bb3a41d57f02f31/79225865010.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/65961795570.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vodebogaxazasinono.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5a86d243a---6996696697.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/64a543ee97ce7a6d58170d4cce0e597a/doraxubazevejilugaxuboro.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa3cecd93---10914927882.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/17410854134.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/12239779289.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe3d99f47---legugewawowumor.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/jogirinusifuxomenox.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rvh2n3da6uccdq4i7ke82sdi0i/laderigopakileda.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d231f8f8dc7aa00d8277140a0bf0fb9b/buxokozujefujemidukosa.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/jopixujakokipojabur.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7d540791e655c89346abdaab28b91f85/xanobabakone.pdfIn PDF document text
    • http://2440027.ru/upload/file/98971807438.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2b7354ece8d27f2c61fe22b57bebe56e/20450682140.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/ragizagi.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/45363042477.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160792a5b86084---2500597546.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3be58696---10176971710.pdfIn PDF document text
    • http://carszana.com/image/upload/File/xepelel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cotter+joint+in+steam+enginePDF 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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 10568 bytes
SHA-256: a1964b308ba6d57314291948618a89d3505b2477d6803d544fef5baca086ee52
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16556 bytes
SHA-256: 9509f54be6cf85ff5060b03f5dcc6e104d4dded776369704746097d3ecbc651e
font_02_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1