Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f80df496ea0269…

MALICIOUS

PDF

95.2 KB Created: 2021-09-21 09:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac6d30fd9a1985f8ae2252f7827f35ab SHA-1: 487ff0d8effe3c7b97bfc0a1abc370edf86ff8c0 SHA-256: e6f80df496ea0269998fe7377f219e10206d53c63e2fc99492eb93c0849e2bc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5abc73d396ea137cee85380375a48518/38947475041.pdf In PDF document text
    • https://threadworx.com/thread/admin/uploads/file/fexiwetebemumijozi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090720445328.pdfIn PDF document text
    • https://invision.buzyhub.com/files/25598978905.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wizov.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/gigitom.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132193571d5d---27545474811.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/25071599345.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907214819.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/37563687896.pdfIn PDF document text
    • http://htcable.cn/d/files/40045764675.pdfIn PDF document text
    • http://ledins.lv/cms/file/demixexizujekug.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/65688083443.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/2471440029.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/23137547457.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/23353579716.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/zavidapafu.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/88046085103.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/xebufexejufitoxuvafa.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b729061d6c157fb8e6470a8c7248f6c8/wuxawididiz.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109140935251730.pdfIn PDF document text
    • http://www.bash.cl/media/file/18353537844.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/44959968195.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/mugozu.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/veruvogizunizefudawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mardaani+full+moviePDF 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_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 10408 bytes
SHA-256: 67ff62e9d8184a86e74c4463b5569e9319886376a04c39faf6cb5fba205a8ee7
font_01_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 17664 bytes
SHA-256: fffa0d19b44637424bb84a8ae1e435f5fe602ab9ce152266dd52b3fcf65fd671
font_02_sfnt_off00015763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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