Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f18d98205f30609…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 17:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c6cfd72efe70fe8586dfe070ed9e600 SHA-1: 398b21adce66a7dd450077b26f9b58413a6b80ec SHA-256: 7f18d98205f30609eed29e9ba0343503b4facb852910828cfebc00e49b4f6192
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which are part of a link farm hosted on compromised CMS upload storage and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=redmi+k30+5g+vs+redmi+note+9+pro+5g PDF link annotation
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/69041552620.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/riuot8ruh0qkufep1giu6h60ks/kubuxaxusosanumesi.pdfIn PDF document text
    • http://analhospital.net/file/files/41539367866.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307dac02416---45063808213.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/fekixivozinewi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41b8d7d24---saraxopixikaxapuvugujuv.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/12391831732.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef456e030e---89493168766.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/pasesuzezowigimuxumax.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910191832.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/91782537679.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/19166688053.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/41446058226.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/kujekosezadiris.pdfIn PDF document text
    • https://seikai.jp/free_images/files/jufesuwovefunuxar.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/76118891855.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab509e330---dunafewijemoneritaroje.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///4836668127.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/93119009264.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377cf690fd7---padudiwexelusuxenosuviled.pdfIn PDF document text
    • http://stevis.cz/files/file/motufene.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dezokufarosar.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/fiwuwokifobupej.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wofubuzomegovogewafanu.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/sewerijatofop.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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 19936 bytes
SHA-256: 6fcda331c4a35e619aa64680c97b13283c8da00231b1be4ad63d0935a2d71c9a
font_01_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 11328 bytes
SHA-256: d183f8a1742192dbae1a43fec384a4de205e621614273460d0a1c10cef9efbcd
font_02_sfnt_off000136ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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