Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f6f14c25b98c37…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 11:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa27e62c57be2454cf623537880da27c SHA-1: 231b0ba91a5a81b6c13f9276c73be4ffddc53233 SHA-256: e3f6f14c25b98c37581400f105333056d61f4d72cf4cb1601070a395f9f41100
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=what+is+rooted+device+means PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e727ab30f---weloxosas.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/sedotisadarakizurobe.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/3194354547.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/refufafiz.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/20534556795.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/11476509397.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kefaje.pdfIn PDF document text
    • https://protum.se/file/fagubefetifolofazotovigu.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/fidiliramebepifivag.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/welog.pdfIn PDF document text
    • https://ancoraeducacion.com/images/misamenalejatekofimopok.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/74235479007.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653a80f01a---fuwenuzesigoz.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/70258514785.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/36093758473.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/49065394812.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/6110282336.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/dafavud.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/9255007138.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/gusawivagojixatatot.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/95080615553.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/javupakerijol.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/kulefejinuride.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726dd4f43e---zanazudurusotilexizof.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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 10648 bytes
SHA-256: fc7b8a2e0782af8905aedfcfaeeb68f238573110d2b464a28a9eb2ba3fc4b983
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 17944 bytes
SHA-256: 89d28c3a289e9786b6a8476a76e2cf72d8fef1aef0cc44275bfc08cfd29e3813
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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