Malicious PDF — malware analysis report

Static analysis result for SHA-256 4173ab6f6b412287…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 11:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f76df12bab9eb33da16a893867cfc8a6 SHA-1: f6f884dbd1894a420ddc9cd10f222e2dad2c9760 SHA-256: 4173ab6f6b412287d436d5e4dc6fcb138c668b189a0479de05293b7742307493
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous external URIs and pointing to compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=dragon+ball+z+saga+cell+audio+latino PDF link annotation
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/sotakesasoripubefogaxu.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/60627494903.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c123179f0---29173234036.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/zifatasitetupafarizel.pdfIn PDF document text
    • http://medica-brno.com/files/83218653801.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed83c28e8---73635097372.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///dewadupopakebumusu.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/vutes.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/48162402452.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/bikedujiwefevimodivapuba.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/puvafaxubetifiviv.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/74573867340.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/girepixewazekulebusava.pdfIn PDF document text
    • http://superazs.ru/images/news/file/wipoliluputimivibezijiwo.pdfIn PDF document text
    • http://capableapp.com/uploads/files/rajebiwejuverojupususew.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/6761983616.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/dudupipawosapu.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/xizukuxedugowimedevosadoz.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109060928339811.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/gotuloxa.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/gidasarebifezag.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/56519016041.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2c7baa06---rilisuvuvasojexefejitu.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/petagobixividejigexubose.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/84406644301.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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 10848 bytes
SHA-256: 6c25e06fd186db61ef8e5ee0eac60cd35268d148e7543ae001d03ef4b7aaa4f8
font_01_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 19324 bytes
SHA-256: 4ac932847b569980f5691c665d0f88403de49690945fda3874b98f0935a1ddf9

Open this report in the interactive analyzer, or submit your own file for analysis.