Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b4f3b9db19ca9a…

MALICIOUS

PDF

81.3 KB Created: 2021-06-23 01:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6569e36950f5ddd27b66ef7982c19de8 SHA-1: 6c1af5fac23cddfcae900e02f68fb9cb8354c30a SHA-256: 60b4f3b9db19ca9acb8b67810e338add0964b15e4f6fd9ad04d77227c3f3382c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The document body, though heavily obfuscated, appears to be a lure related to 'Oracle developer interview questions answers'. The presence of multiple links to potentially malicious or compromised domains suggests an attempt to redirect users to phishing or malware-hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7d5085bcec29944dce04024cba5cbf0d/wijikova.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/59080dff887b4cedb85478954b704cac/fisosenelejuderij.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cno5g14idtn2pc2mo7tec033q6/31111374188.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/lokisuwazipulubom.pdf
    • http://citywideok.com/clients/75789/File/59901552171.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96ea80de74a476d86439aeaeb3d42c71/jonofojuzibiza.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/73096252945.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/13d9ffe7e7a97abd215c2c0f91b1b02f/4153142175.pdf
    • http://otoozevran.com/resimler/files/zokuti.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7b7cc03bed0feadf00619a02ca994c9f/43676632852.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pl4p54sbrr7fa28pnvmd11icpq/doradowifapowikasula.pdf
    • http://dichvuwebsites.com/media/ftp/file/7357375021.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba8e07310---birubujosarev.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c76d022a---24583385522.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/68bd7a0bc231cd281f23ab6819d1f689/48170028947.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ba890d93---80478747482.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4a7b438fecc5595437851a0a5bd8ae74/85679067635.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ad39bfcd7---49553958029.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=oracle+developer+interview+questions+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9f.bin
5970e0f9e8201f81cd3ae33b5cd6719940eb8ef8713e8ab398e30d99ff1c7c52
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 5372 bytes
font_01_sfnt_off000110fd.bin
d95489ca82a18e4a26611010ebc1437317d3ac91dd7c34447118148f407b7eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 11444 bytes