Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb6ea02b2eda913…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 10:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cd9edf417248fb5fe04a2109ace9a6c SHA-1: 08453b63fad95dd01886def87c070df776f815b1 SHA-256: feb6ea02b2eda9133b822d9427e606abc75330081575f2fca07f7b54195dcfe7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised websites, suggesting a link farm designed to lure users to malicious content. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=minecraft+mod+apk+java+edition+1.17 PDF link annotation
    • http://thermogroup.ru/uploads/files/xazuk.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/namefebaxib.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/24537992502.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316226d3657---76290808790.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7es6tbf34s2himmneco73m8op3/24023330022.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/67252365221.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/zipipodanokun.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/numali.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/98172791108.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/90016365431.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/kupoteveridimamelexer.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/mifafomova.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/tebezarifarimolijozisifu.pdfIn PDF document text
    • https://chptravel.ir/data/file/doxazixizagadere.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c2e35931e---powexetepeg.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4b19972bdcf8770f59b9c8ac0eb7220f/bazekorofu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/87034976891.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/70857958953.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/59138454104.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/54831541192.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/piluramir.pdfIn PDF document text
    • http://markone-tools.com/upload/files/17210441125.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/96953855401.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/zajigopelarovamamulewulak.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_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 11016 bytes
SHA-256: 526497d2009780911c53bde269b1e7215254292b80f8322f1e87c8a64c073cb6
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 18000 bytes
SHA-256: 1167a7ab06b6616813156fafad48bde7143c9403ee2c8be2d16dcf2579ebeeb4

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