Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2a5b901343f7f1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 04:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67c7c32f404291d25a33055722552b35 SHA-1: a05ab35afa31b3ef692a4e5a5882a95f692e8ee2 SHA-256: 4f2a5b901343f7f1b2cb448f32f6cd62364458a7a5ddd8a6ffd57e725302f319
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://myepres.com/HotelEstimator/userfiles/file/buzuji.pdf In PDF document text
    • https://mmoxx.mn/userfiles/files/10079887146.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/rewuputawida.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nupejuliborajisifopusa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03cea702a---pugunavigizuvinupepu.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/78052861714.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/towekuli.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/fulogevexagilujo.pdfIn PDF document text
    • http://acelybio.com/upload/files/40662864142.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/92730407362.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135d222735e4---vumojadipoxezipagof.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/34746421078.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/bejubirelefaleluv.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dro7chmb26v7ckcs8jhpf7usic/72140486631.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/75286591876.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/65516504359.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/fuvibiziretativ.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/gotisimixopipevujuxesanez.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/vipamamogifakupufejexi.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/73523288812.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/6366806801.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/balavux.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/86813308557.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/40847494934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=different+types+of+tragedy+in+literaturePDF 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_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 10888 bytes
SHA-256: c45a2e8c555164cdb86cd751d71236ac679f9b8f278d86af63b6ce1981848518
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 17304 bytes
SHA-256: 9982bf789d0d6ff0022653f0ba56efafbf699d7ec834334e72eb33da4f8655ce

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