Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ab820b6a399502…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 02:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5a3bae6460af9382df2c5b5187608a6 SHA-1: c41a67cc7162504d673138d60f950262660794d4 SHA-256: 18ab820b6a399502679254be91661cd47d959a64b287793a39568506b71d03cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is a link farm pointing to compromised websites and potentially disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.eau-msu.ru/ckfinder/userfiles/files/kuzopunegur.pdf In PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44886380391.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e652524f9f---70192575277.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/vajuxusebikitetutuwej.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lamaxojuzofisoxeb.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/93241016303.pdfIn PDF document text
    • https://renault-service.com/userfiles/21134815154.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/75225252761317357b17cc.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/gokodide.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/mupagiva.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jatutugupibemitajadizep.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/54143686342.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613faab0085f5---57964470398.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/dumewebanoliwinegi.pdfIn PDF document text
    • https://eternalbliss.net/file/42096594232.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/rizivab.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/42498334656.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202108311853306827.pdfIn PDF document text
    • https://intersat.lv/files/file/23753917895.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/sirokufasosuxijaku.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/62332859104.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/janibiwozipunujigagez.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/02efed0700855d96d33ccf9702b098cf/18562389369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=comprehensive+clinical+nephrology+pdfPDF 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_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 21836 bytes
SHA-256: 573340fb265feeee5bec892898fe94c8b02c5458a2086d4b874d7384ad84d9c3
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 11180 bytes
SHA-256: 5ff99f0d9145a848d971807d2d170949555210e13ef6ca7b4e0e3c36f441b98e

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