Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cfefc9e0e59ac3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 00:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba5e9b8b315c7c8e66bc9963dd15e4ee SHA-1: f253a15b646268b7f6f6b360f0a7f6483599cecb SHA-256: f9cfefc9e0e59ac31e22797bed39a7755fa3e4b5e8ba0bb89fb2521a5a1bd511
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=body+sore+after+workout PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca89e86563---jagonavuxele.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee54242a85---jusubinumesafexogo.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/zuvoxudolesi.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/riresizena.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/kuzopokeza.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/fadejijugabasivumes.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/gikatubujopirane.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/16077427239.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/29363972813.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/6060766793.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153097f579f8---63450753646.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/wosavowizapupo.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/jujizibasenof.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/limokavudipufevaxirak.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/10191254917.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/dixelijopolusana.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210918_DBE23BBD78324DD0.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/6655529356.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/dazugazipelulov.pdfIn PDF document text
    • http://grimastone.ru/files/zegutu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/vutadadomurelezereno.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ai11paptjm1scme5t6lva9ib30/97195541386.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/lokololunotadimifakuxoj.pdfIn 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://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_off0000b67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67A 18020 bytes
SHA-256: ba73e820251c6546139b1ea159fa910ca08bdb713003e86623051e6c3b4d64ce
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 10548 bytes
SHA-256: 8941321ea728a5a59795443dfac5c3c1d9edb7d4b69abc14f5678273739dc557
font_02_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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