Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e948fa2d29214a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 14:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 985c8a6961ab3585581411af686c5af5 SHA-1: 6e0aab8fcd7ca7086d8effcbafef1e4bff951829 SHA-256: 43e948fa2d29214a6c44f8ca26766d343afb772758d063ba1ce678cf9c592803
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, one URL points to a compromised WordPress upload directory, suggesting a potential distribution point for malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sistemagestiondpr.co/userfiles/file/9698173310.pdf In PDF document text
    • http://www.dilipprabhavalkar.com/images/file/33767981238.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/dajubotisoxuloki.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/52348250443.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/nowokadubuwevatalelikun.pdfIn PDF document text
    • http://goref.ru/files/file/89077610306.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/zemozelegunuvovalago.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/gopoxolufivasujige.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/11778131531.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ooegh2alc4j5qjufncosrfq75c/16424497513.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/soxupetovonuruxagid.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161451a71bd0cd---xusasobajamifulazifajuvam.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/pegikamum.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/janusaveburob.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/30214609838.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/bopisewarazipitilek.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/72488195415.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1c0da047---4012665318.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c651865---fogipefozuraki.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/220043274856.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/315c925e367e74890116ac68988cf096/83404567024.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/kavopufovas.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/kajuxataba.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/99426129376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+red+full+color+hackPDF 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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 10576 bytes
SHA-256: c87c3720df31eae84f633cd30ec9d15e03ea97e4a57e021c383813c77cf8c140
font_01_sfnt_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 16504 bytes
SHA-256: 0dff6900dab4e8ff602945040dee8f6f568b4fd8a0ac3a8f2074b4b4ff332981
font_02_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1