Malicious PDF — malware analysis report

Static analysis result for SHA-256 890b4b29bfbda593…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 00:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1621ff8f3d33b8d21d166028af948c5e SHA-1: d87bce44cc251de5069e28e0a40430a2e75a3b57 SHA-256: 890b4b29bfbda59320daf0c805ad7af84a165e49aebbe369457213293cbade3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://weifong.tw/fckimages/file/teviw.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c852c53303---pivafijabi.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/sasudesoripasebisukibuzor.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/xesonerawazaludifoxufewa.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b45e9a6712fa422a535fc7667f4c1e14/tegajivav.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/99245922873.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0df46f51d---nekapurakopi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e1327e6a8ae924c203f0e0507a531331/polipobatep.pdfIn PDF document text
    • http://tianfonmm.com/d/files/supadoziwuba.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/zalapesikagukapolidizof.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/38820166006.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/73897892250.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607490b7aed8e---4839981812.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085824314136---kovotewuvek.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/tozufagekopowijut.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e819e8dd7b---mujuvurufaxozawepusuj.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/tigujofiwunuzudap.pdfIn PDF document text
    • http://taumed.kz/upload/2021/08files/210814004623495446zz65c.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/vojod.pdfIn PDF document text
    • http://info56.ru/userfiles/file/68514056236.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/rakim.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e1935404c5d69b76c79e35f93d07e615/desanufiwogulaluferir.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/datuparufunigi.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/88306600779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rateable+value+of+propertyPDF 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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 10452 bytes
SHA-256: ebaa76614d2ae60f790d80719b376de9e80e640af8fd308e62312405011711c5
font_01_sfnt_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 16308 bytes
SHA-256: 0806440a76a61450ae7efe19a2e1e3cd2a533b03e5f6b136c66f577026de2896

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