Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b33fc75b226267…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b83c86465faa9eae59dd151b74c41fa2 SHA-1: 36ae44faf59a8002799a4183c0108f5fed5438a9 SHA-256: a5b33fc75b22626787d5f05ec6778a7461d90763ca09ab5e3bb74d519eb31d0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/sesizazodu.pdf In PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/652127107.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/jotelezanukobin.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/72879125648.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/bilujop.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/lejoxigokuwo.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/maworikunuf.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/58310640405.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/51663683897.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/55020940133.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/63466214080.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/nosoresenevekofunej.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///37769410573.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76227157706.pdfIn PDF document text
    • http://bubb.cn/up_file/file/jipakofalodi.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/8928257974.pdfIn PDF document text
    • http://topflexsports.com/uploads/52168731165.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/nowidemupukizutokakosusur.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b0a7f4b6---61226833904.pdfIn PDF document text
    • https://cargotavio.ru/files/file/904397549.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/34811441247.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cdc15e8720930085b83d7e0df57b3194/88784637410.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413030cc62---zezegiloxajaka.pdfIn PDF document text
    • https://atlantidegattico.it/file/41593754832.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/xitemenezimotokiberida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mesurer+distance+google+map+androidPDF 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_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 16576 bytes
SHA-256: 9243a92b538674a3e400554120529181eb6286bfd0d4f1547bb8ea419e9d1f68
font_01_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 10952 bytes
SHA-256: 07e1d4cb9e65a168d1d7d300f98f3ad7603cb74df24d7d6e0bdf8fef08b63507
font_02_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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