Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60da3d475e1327e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 21:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce52a5ae60fe2fba24cf628d16f2aaf0 SHA-1: 3a7bd6ce8e2aea7d63135906937976eee4736449 SHA-256: a60da3d475e1327e248e83cf4a621a02ff4e351e3b7afadf675ce105d57b8a1d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oecschool.com/userfiles/file/65719646496.pdf In PDF document text
    • http://lnyuanzong.com/uploads/files/20210908121034.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/sagesumo.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/wumixuzemenijudozowiwa.pdfIn PDF document text
    • http://hangquangauto.com/files/63294222002.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/67857959652.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/387a5582d411e7433ecd5cbf99fa2a19/wizoxux.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/sesuti.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091410205489.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/10270797590.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614891741a9be---lapeto.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/66189737739.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/jalomutimoveli.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/7707949140.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/73800766492.pdfIn PDF document text
    • http://zaiger.ru/img/file/vobikizofonobekugan.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/tazitupebumoxewepojugojeg.pdfIn PDF document text
    • https://pixel.bg/img/file/fubizafumedamuroguka.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/99618181145.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/wadepi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147539cac215---mobutoniviraf.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613833d3065d2---rokiz.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210911045541.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/11261179650.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/30pfmrh5b7lc572f0rkbcu5kau/sekibogomegozujolikoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=asphalt+8+airborne+money+hackPDF 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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 11176 bytes
SHA-256: 1e64a1fd0298f3a165d93af8deabe2fadf581d33261a3c3cdbd39db9772c45c0
font_02_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 18104 bytes
SHA-256: a9e3889e3dc48d99cb034273e9c37f74f7f9fef8100c4c89917c7797fbefa87b

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