Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd50dcb431ba515…

MALICIOUS

PDF

120.6 KB Created: 2021-07-27 07:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a0afeba72fe661f18360a199ec18422 SHA-1: 544f8b7cbbd8866aaa9f6898be989bac53c28ca4 SHA-256: 9cd50dcb431ba515dfaffb50f6003ddc4385b3463f4e434a6df1ca550fe46e0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc0d31a778---87570349542.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/05fd3b7c82e793921b7a7b7c886ea022/kibawupafebujozulu.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/zukonovekejavedef.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d57b77da22b---papagelavotuvege.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/15217494898.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/29865429504.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/10870907118.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/2619902467.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/14931322922.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bafea9b3d---tevevum.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eb64827fd---81711983651.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/aq7c34rfp34fu00h9v29vbste4/puniruxejigiwe.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d640d57c85---zadizipasusazozibuguv.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107200315437581354vgvo6.pdfIn PDF document text
    • http://centronegozi.com/public/dasewijadob.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/naluwetetebapizonenukaf.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wuputokam.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6cf6f875---lonobudufupoxe.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/xirodopexaganid.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/7039888625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=personajes+principales+y+secundarios+del+cuento+el+principitoPDF 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_off00016ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000186b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B7 19420 bytes
SHA-256: 6e6b85c037679c02d9e62f2729eacbd9d3f1d6b6f54d4079567169032903f286
font_02_sfnt_off0001b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B876 10852 bytes
SHA-256: 5aa096a8ed5d22a63d8b01331c3e425316283dbf534367d1dcf9e5c0dd587799

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