Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1008afc8b71047…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 21:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60cb4b1ed7533ad251abcc58916f5ace SHA-1: 5b026bbb5d7cfb4d7c378ae3a0e03dc60fb28cad SHA-256: 8a1008afc8b710471ec3977ee12cfc155bef6cf61cefb7f54fb850dfa35e2d99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=watch+dragon+ball+z+kai PDF link annotation
    • http://htygroup.com/upload/files/29731187464.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5fff0495fde5f16d99d6a52f7b4496a0/vuwoj.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/vizonekelo.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/zoxenu.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/raxuzufixik.pdfIn PDF document text
    • https://halead.com/uploadfile/1631829150.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/xizudikododisupetokef.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/26337615315.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/risifakixijikutuxekevafof.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/81803573586.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/wupanivu.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/vegaxigijugebowe.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/95529749175.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/gojafi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b56396d41---35516211010.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/kemavafovefaten.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/66550462317.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/lenivakasof.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/panabola.pdfIn PDF document text
    • http://irths.com/upload_files/files/38136985601.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/sezeko.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/devivajepokizarixa.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mijuxexowademirober.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/lowovijege.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/67ao9m49g3ptp5h8l5ec53llm7/21228163254.pdfIn PDF document text
    • 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_off0000b039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB039 15636 bytes
SHA-256: cde0597de90bb698847412ab6896ddfa2603f6035137f7e3fe286e54a845753b
font_01_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 10632 bytes
SHA-256: 622ca95f9426a73feaa40fd530ccf7a0e89cd5a1320c52bd2b902e3dc714fe85
font_02_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1