Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7c1e44259945a4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 11:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62d31a8bb8e457736e63e4ddfb572a58 SHA-1: a198bc452612463bc0ec49f71126edfb52115448 SHA-256: ef7c1e44259945a4337fa894673df948d2bf7d08a11beaee3f369f1a396e91b9
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of a link to a compromised WordPress upload storage further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://moveworldtogether.com/datas/files/dimuzo.pdf In PDF document text
    • http://yuha.be/_files/file/79990042758.pdfIn PDF document text
    • https://stopserv.ru/files/file/69751927023.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/26627912730.pdfIn PDF document text
    • http://africareview.in/userfiles/file/67966134528.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/memufevokemesupukupikusij.pdfIn PDF document text
    • https://windsbs.biz/files/file/xalit.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/72399782283.pdfIn PDF document text
    • http://cascad-trans.ru/files/remavosimaxetarok.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/1590196240.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ab0c28749592deaf8b1a6a197e60aa71/rinaribodew.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d54025c---10621562845.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161316c4591ef3---karoxopuxutoxagakoneruji.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6fe570a6---41004399825.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/73159372094.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/vepijabojobenupalud.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-6/20210906151527478331.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jitokerufobe.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161369810447b8---nozedeloxefexojuzenil.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090322325270554.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/tapilubikulumifebav.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0pepsl6na7vrh7vgsfp3bj1lh1/86084429060.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/nirap.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/15455871135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=avengers+infinity+war+full+movie+streamPDF 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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10904 bytes
SHA-256: cd6e6b7460ef72a039cdb2ee27daa50eaa9a0802b38a4a8debfb4a66ac9e7950
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 18224 bytes
SHA-256: 61d000e6289fb288d4f1f751b7fd62fdc21ea02d5112ea5639a29831f616153e

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