Malicious PDF — malware analysis report

Static analysis result for SHA-256 f079c4e2f5a4897f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 17:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 281bd885943e0548d02bf628dcd21486 SHA-1: e6d53859d717bd01a1532a1bcf360f8a560d24a8 SHA-256: f079c4e2f5a4897fd9edc11b6f985c272fd5c1d17813c69cd66076d16ed81957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=focus+on+ielts+pearson+pdf PDF link annotation
    • https://defi128.com/userfiles/files/dajimefozafizewazebe.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/kodadosotitukev.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/31051900724.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///jixerez.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc131b4894---10329444562.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f03e4403---binewov.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/lekisanozen.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76741013ba---madomedizopumumibegisa.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/nitixizofebogiwaxef.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/nebamulujobusedanir.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/22053767717.pdfIn PDF document text
    • http://artside.org/data/temp/file/xodiziwusukibukowuzida.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/b5ce8c645aa96c6da7ef5c060a284e8b/45760281792.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/45050787555.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/tejugifogizutokaj.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3c989ca6ad7824449f15df04886ffb64/9620297458.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/80572927612.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/89860123874.pdfIn PDF document text
    • https://cargotavio.ru/files/file/30076513985.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/kalofefuguxonog.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/faarhg3gtcno77s2d1roqgl7v1/48652844512.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16117931a633d8---20938478080.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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 10688 bytes
SHA-256: ff743b9551594b268ea6736bfe59fe5cdd1c75fe736a311f3a0cb3c743c15a2d
font_01_sfnt_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 17144 bytes
SHA-256: 15b93ed91888f64bc55701c7e40376c5dfccc8d57de52364f9e3238892aa501c
font_02_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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