Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9efc9cc3b18b9cc…

MALICIOUS

PDF

73.1 KB Created: 2021-05-28 06:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9de14103cccb1a19de19ad5a1a27ba SHA-1: ff0bdbf73dc85163e01b791f3e402a6eefc7bec3 SHA-256: e9efc9cc3b18b9cc54413058e06728445cafc511fac3cda06c3befa48cfc75a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host other PDFs, suggesting a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and numerous external links point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sindonis.com/userfiles/file/zorilibugijutuboxibutedel.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ec7cc0f---lunakar.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4c86bebe---sulesakazisubopofajof.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fcf8c1a6a9468352d3e7255ea56583e9/bibomibafiki.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/gugeroda.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae25e41e6---59170040631.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61fd47a37---gimoduverexajirujisot.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793af5ab7d3---zolivufobeperara.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/64f062a3b18be27e9fe7347519e98f7b/zixobelitudarudefawa.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6ba3b006---wufipalizaxafituxubafuri.pdf
    • https://psfund.org/public/uploads/files/cms_files/80404712404.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/239329990ebb36cf5e973b2c65de0810/peginizepozamepape.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3f5d3a5f---vawibonivivoruri.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a505d857d57---fepukuvizulal.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2onf9s5mglgnasj1bt8qf6ukuj/bapigimuxofajesar.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/a27613682367d6f9bf027087e910102b/1432019727.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/696ksfrgir5abb4vsi2hf034gc/38907516596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+hack+war+and+order+game
    • 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_off0000dfc9.bin
88c67a6b884939282b8ff3fc8d3255bf375b3d7a76d03e4a865525a83361cd51
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 5260 bytes
font_01_sfnt_off0000f191.bin
7714e1825e957c20f29a2e16dffc8639c3e74601d0c7da35540d15b0cd91b82f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10788 bytes