Malicious PDF — malware analysis report

Static analysis result for SHA-256 24868c73b130a098…

MALICIOUS

PDF

74.5 KB Created: 2021-09-10 09:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 472ad15107e320b5b6f56fa2901d53b6 SHA-1: 7f23412ace2a2a452018e127b2dbac619f0f66a6 SHA-256: 24868c73b130a0987db3ba2952d52176a8aa9c64daf3995fbde54c0b6cd3fbde
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous unknown URLs, many hosted on disposable domains or compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tecs4.com/intranet/ckfinder/userfiles/files/pumoketobewuzom.pdf In PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/jevomowunazugutapeju.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/venalugap.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75ccc1b02---resopepilawigutesobuxifoj.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/71611674250.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/53221122590.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///fabapo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb0d58e61---68327183525.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/fafez.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/lewixudorodurerete.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/kaguvegojulomej.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/xavalepavevumarolomizib.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/vagodotew.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f93189bba7a41393a3897c6c77ee19cd/rasunumavolel.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/79109657639.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/doborises.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/jakigukib.pdfIn PDF document text
    • http://fourfoods.com/images/files/40722251362.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xajilibozibimiluwom.pdfIn PDF document text
    • http://synhbio.com/upload/files/3563537461.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1fd87e13082bb1590c116cab3c5311bc/galonemumixarowigixugobu.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/21957248769.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/83093632057.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/defomil.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/50375958148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=brief+principles+of+macroeconomics+7th+edition+pdf+downloadPDF link annotation
    • 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_off0000bf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF20 11076 bytes
SHA-256: e9c72ba7f962b8676c1013c1a86a135955300a2f38288df381956a04afb2641d
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 16760 bytes
SHA-256: 9d139043726233b9143e6051e842eac3d7f5b7603583efcf31551d8e837b3052
font_02_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1