Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f59eddc2347bd4…

MALICIOUS

PDF

58.5 KB Created: 2021-06-21 07:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e0f22125d05786e949745cf5eb477c7 SHA-1: e520e9edf76ff61c9a6eafdf8d5029e311059f46 SHA-256: b4f59eddc2347bd45add752da5d80ab9e95286c0db8854272cbf54dedf2fd683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple compromised or disposable domains, likely to host malicious content or further phishing lures. The document body, though heavily obfuscated, suggests a lure related to 'Cs go recoil script', aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://noospc.ru/SITE/files/editor/file/fuxipapoxixalakegomeki.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899273e9baa---13042608579.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078a702b03be---41917535682.pdf
    • http://tz5168.com/uploadfile/image/2021/06/05/file/20210605_031557_105.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777251d8fe1---96053615069.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe9ddbe4d2---46284575732.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/93405431624.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/bevun.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/75309a9b0931f9408162463584e00de2/4012886584.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f46bfa7---51237696423.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0a6ab3415abcfd482147d29633d58f89/71404678694.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4752237003---78403816841.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97beeb6ad7450d12c56f44e0530d00a2/51300554937.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717464915c8---83152545757.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/volebalixanugapa.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4fc1f1c53---67577886921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cs+go+recoil+script
    • 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_off0000ad83.bin
4ddf612db6163b8466e097ddf17b27ddd94f0f1b631e5b481a34f3cc31683bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD83 4796 bytes
font_01_sfnt_off0000bde6.bin
a0e4b9f31382ea5ec46376f9c4ebb5b232ae77366947bac257e0ffc97803da5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE6 9248 bytes

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