Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcc668fa3156681…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 10:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cff1c208e1da8ffcdefc4692b580c870 SHA-1: 2071f4d1190fd0bf1fcf08f5a482b618bf3504ec SHA-256: 9fcc668fa3156681a34c0fdaf0d0cfb0a380d8a2eb366559ec62f3ff74263078
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=free+renegade+raider+fortnite PDF link annotation
    • http://watthaistuttgart.de/userfiles/file/sagoremu.pdfIn PDF document text
    • http://domexpo.ru/up/file/fovafugatilomitebaf.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/19090608694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e50506d0f---lukizema.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/powatesebotaburadisuza.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/13158a0a2e513c320f8c4ad202c72a72/dituxumulizisuv.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/90836012418.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384911d40c5---lazonudegi.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/ruxud.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/delinivopisurevaxaga.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/namosawufun.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/65740157111.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/faxapavijisumediwaxadota.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a088cfd0a---7947392563.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/49320629446.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/zuxovan.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613321549eb1e---fewalu.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/50239078047.pdfIn PDF document text
    • http://normel.org/files/upload/file/merirud.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wixosata.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/bujowimubulokiwuwadufo.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/15226806502.pdfIn PDF document text
    • http://puisan.ru/uploads/file/65989489924.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/81456998296.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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 17280 bytes
SHA-256: 0fc2e9e3cf61c7073a7614841661fd333ad8623d714ba8659bfb21b80c2e0afc
font_01_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 10292 bytes
SHA-256: 050f07f181eefb2902e26b6560fbb57617ae56401175acfb4914817a5c2b628f

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