Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec1a1465a318385…

MALICIOUS

PDF

72.3 KB Created: 2021-06-07 21:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c8bac2125de0368e4175693045fc68ee SHA-1: 88b787af5cf5558c1509a12f436c58aa9de5dcf3 SHA-256: 9ec1a1465a31838528b11262ab1f98cf51de6c76e4142d50acc90d838236b9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely attempting to deliver a secondary payload or lead users to a credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=exerc%25C3%25ADcios+sobre+associa%25C3%25A7%25C3%25A3o+de+resistores+pdf PDF link annotation
    • https://agentcctv.com/userfiles/file/tuzixenomonutidunerisil.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/sesapobipavexoxiwufedim.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/52e21e9264da7c08952098542f3cba97/40383024945.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4b9442cc4a49ff2762e4d7e27e5035f4/kuzivafinevunuzulugatix.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/famujapesugufulu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wevomaxexam.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb81a2693---lidawuzuzaz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5ce66310---72247479832.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/15ab03d54f8a6cafdcea6dd0fb34d259/feparo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/eh49b3l1mehl1bvrprsjclagvu/sejejotuwavidosinesozuz.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099947143a84---wolove.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bc2b97ba16488aa74d37c40c9db6cc6e/gapewoguzoginerizu.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/377c653b12d41fc73814745a12b6bd5c/vaxenuw.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcb6c8d65d---74355128138.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nco3eru17gv1i09ja98s98ielg/32669084649.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d228630ee---25930836249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 5836 bytes
SHA-256: d04a5d4945ccc8aae1dc4967370d4ed38e60cf884e7bbaaf58c5dac5351aa7b0
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 11912 bytes
SHA-256: 5b4f95732da40d47726bfd2d8fd4f292df15a34353aa0ee2a4a8d27f51743e69