Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fa9de0f66d6779…

MALICIOUS

PDF

96.8 KB Created: 2021-07-02 09:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e96b8e8057cb3b1405d91d30df3e403e SHA-1: 4837b4c03760a95d3c575c8d677ac7ec27e93bb1 SHA-256: f1fa9de0f66d6779edd020c71cb5c5050bc004edd6281adaba0e92ec6f9ba573
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of a link farm pointing to compromised WordPress upload directories suggests an attempt to host and distribute further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://makiriaszto.hu/ckfinder/userfiles/files/tugagatadozebeginokano.pdf In PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ju9gfg6pqh2j06e104iniu3mtv/zedubotanezunivu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7d73bdca---lipunimarebaporadalusi.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nolowomelagegorusogelape.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cf2f23c13cd99c5f335fecd3966bd03a/36528380593.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad52d2a79c---30931197382.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/eq39mllqeo5384oevqlat8rlem/28832505408.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1bf6e2347a6dc3afb22a8c47a2e783fa/95900584566.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/86985660534.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/79103218940.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160836afdee1e5---tuzelamamoxegajujejid.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18ea76799---89383586071.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7f10eaadba40b8b7c8d3009ef783f0d3/xikizazedovujasexak.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/234ebb03b1ee252b72cf25f3b24477e2/mibaloxitoxijijakizel.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/somivuremikanirusi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095df2676c77---16963984135.pdfIn PDF document text
    • http://npas.ru/pic/file/27459181081.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/biroxigopowop.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c885466a---pivedax.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/anse9jsqrdiqndrjffg18asaq9/5075660191.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ugt7l2c7704ek5orn5havhhjka/19530056661.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b0d246a85---65161030775.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/45080184030.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/17r8dee5t08274g63dmfv70al3/81931509461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=x+ray+for+windows+10+minecraftPDF 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_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 17828 bytes
SHA-256: 9d986a87e32ee44a0df61d1fc4f2ec97c9531f3f42e7480cd52f22e82beb85fa
font_01_sfnt_off0001448b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448B 10972 bytes
SHA-256: 7388a444e41443cf7f4b08a3be96eccd5b47c6005061b416e4b245d2d776a086
font_02_sfnt_off00015e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1