Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c48affb416e577…

MALICIOUS

PDF

91.5 KB Created: 2021-09-08 13:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44d4d3da5a9fb708a784e2c9dad57be9 SHA-1: 114505ca5a188c56950b8ceb3a889fb491345e64 SHA-256: 24c48affb416e577b9dfe69f627e727473c8994089b63affbb591e1e94d2ce89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ventiliatoriai.lt/js/ckfinder/userfiles/files/59874027645.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/93882692659.pdfIn PDF document text
    • http://xsteelstock.com/d/files/zewixiguvok.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/69777783644.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/jajukak.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bibesotazeg.pdfIn PDF document text
    • https://tuinvandecruys.be/file/17158113031.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/73543055622.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/60728088187.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161304fe32bd6b---78923369681.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/373ea120496acd155efe0a02bfc3ff20/bibujugoxube.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/4340549581.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/wabomopexokirevuk.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb70203ca---waxujoruj.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/5966345107.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/12304151014.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kamilibib.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/dabeki.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386f15eae9a---22385334546.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/55199540546.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/tovikemita.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/vekezopafanifosivawapeb.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362baca4eba---11874901314.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109022017159553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=4000+essential+english+words+pdf+downloadPDF 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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 10964 bytes
SHA-256: 43b9dda63dee7f4e9b2b9c2fb5e11275f4236470c8fc53ac76619bffcb349c39
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 22964 bytes
SHA-256: 88d520754f98090962d6f3e3491b15294375f6975dcf6c09938a8ac64e28da45

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