Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcc71bfacd21958…

MALICIOUS

PDF

70.5 KB Created: 2021-05-11 08:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41ab1be2429a9d46087a010e3f961eb3 SHA-1: d1886817aba65dafac0eeb7046e212c2be107eff SHA-256: 2dcc71bfacd219582c79103e55100d9d40c8b9e462c069fa4feea167eb89f387
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or redirection campaign. The ClamAV detection and ML classifier indicate malicious intent, likely to deliver a payload or redirect users to malicious content. The embedded URLs and the nature of the link farm suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9584

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=transformar+grados+celsius+a+rankine
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607150d247768---17545025956.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086816f5f095---dagetojanubojawivuwebib.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a42682b59---wagevoreji.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/88aldvcnhqq22j8n9e70kde4p3/wijedobakusuzanet.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094590682bf8---motiradudanixigirivite.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/982650h99rf51emt7nflb61li0/puwoliginaxidotod.pdf
    • http://adance0112.com/upfile/editor/file/sasewusowubowonejo.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/54378668426.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703567bf270---19920273596.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ece4ea9e6---rezofosumoxeminofujo.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b3f37b9a95816bd331f848b5172a62e1/sapugexusonar.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/76137989fa80837373f29b0feadf0c32/mamuluxotaxivenedove.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34177ab04---52345251825.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b792b0c644---lefekogumawunarexadu.pdf
    • http://alexlunacoach.com/img/editor/file/zatamozunijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc00.bin
b438afb9c4c6ee183d550fc84d96963e2471e89bf1d89c346bd7e2b3fa944921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 5356 bytes
font_01_sfnt_off0000ee21.bin
4c96604771155a3abc2aeba7ace44bd6c0c684dd9c83a6af96ba6bc296a5705e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 12744 bytes

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