Malicious PDF — malware analysis report

Static analysis result for SHA-256 f864ffc71e3f63e7…

MALICIOUS

PDF

93.2 KB Created: 2021-09-11 20:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 227d30004e4792949d5faa18dce0b1b9 SHA-1: 7a9b4dcc8d7618f3b75e96d7c235b464db73b7e8 SHA-256: f864ffc71e3f63e7b910d86805cd36f43892e1b505d68681fb75067f42d5ebdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised content management systems or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://himalayanespresso.com/espresso_ckfinder/userfiles/files/40573454304.pdf In PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/45146404224.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613054c201969---pubirogisiwuzopuvepim.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5a040bcf8265a4bb3af8712f50d685b1/21554485178.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/pajilemimivenirewut.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/78419377657.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/89724024142.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/93477528288.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/24847039883.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/tukunurazuvavipop.pdfIn PDF document text
    • http://canadianrockies.info/files/file/47415754226.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/zumojonatokunexita.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210903152807.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/dosapopurotexurafuvomit.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a20777f4f---wekasebunup.pdfIn PDF document text
    • http://llux.vn/uploads/files/jusepifufi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/mizixopiger.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/34622941339.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/lafupovugeliketo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/53770209524.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/kogawojede.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/53173348718.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6114ef3d505a4da0ddc6ffda8f3602f8/wakadolofibuxifukij.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/xizadizonebarapifodego.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/31565285195.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/joximurup.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/lipekotijitawudimu.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/jezolitixekitexegoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=year+9+mental+maths+testPDF 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_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 10312 bytes
SHA-256: 88e7df6c54f80314e940fa18c665864dd4db8c63dcfecffa633ed328224ff626
font_02_sfnt_off0001358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 18760 bytes
SHA-256: c5f5ad3eb73611e4fc41a4e7fd64ff87a1a77c26b5a17dc93365fe50f306cace