Malicious PDF — malware analysis report

Static analysis result for SHA-256 8689f5ba82292c50…

MALICIOUS

PDF

76.8 KB Created: 2021-06-07 02:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c69d6905120743b380b6f3f1e88dc5 SHA-1: e093a9677db2d7aeaf1db51890da42a92be9f6a7 SHA-256: 8689f5ba82292c50bd2a91b2e9fb7d4f3439274909cb5b7d04826ed1a9911990
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource.

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://crewmak.ru/uplcv?utm_term=batman+animado+peliculas+completas+en+espa%25C3%25B1ol+latino
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qnopf78j4vstpe6jv6mone93c9/xaguxavape.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8f37010265d8685b9dbe9372f10776d3/76618998007.pdf
    • http://analogsys.com/uploaded/file/1332423829608bc2f368fc5.pdf
    • http://luxe-pools.fr/i/File/7988923531.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f315a4f55---demukeragekilemip.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/24a6190f5658b941e49836ad8298a0ac/95812770693.pdf
    • http://aihyang.com/userfiles/file/5567376208.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dafd71aed3---woragewiwomulufuzekuzim.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2c4af78eb97e68d48be10e98e2f35a36/57361536151.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5b88e65bad27322da26c030dba424fe9/33042031032.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab169b6fd8---65728330026.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72b0291f2---86067694762.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ce23c29b---legunedavilo.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2f47d8666e991c59436f0d0dc2bf6cfb/tebixet.pdf
    • http://skogsformedling.se/bilder_umeny/File/78613730422.pdf
    • http://adveotec.com/img/file/14905319934.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000eb37.bin
5e86cc9de0dfc1a263f011ca84931ea9f25613cfec17662cf603594d8914530d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 5384 bytes
font_01_sfnt_off0000fd33.bin
fd82bf6a6c40a908ac9d467c5a5a0345621597fd3a33559a6aef5fc29e2e690d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 12252 bytes

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