Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45a67897360b830…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 17:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ecba779a3e0e33243ec717d0f744bc09 SHA-1: 014583cdf5903dad3025ebb5b898291a8a591534 SHA-256: a45a67897360b830c4de361749d4bd93ff49c7fe351288543a5d0302080f1ba4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sikahaiphong.com/images/news/files/nevugufawunojixuruniret.pdf In PDF document text
    • http://kaus21.com/userData/board/file/52270856465.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/jetigesuruxurotanoxapi.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kodopaxiwuv.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/67705152484.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/gowufejavutuputizivavagow.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/21571423279.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/jexupifa.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/23547178348.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/62682618978.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109192236423278.pdfIn PDF document text
    • https://thietbigas.net/media/files/wonegateratapur.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/subosewemigetusim.pdfIn PDF document text
    • https://pindimana.in/uploads/file/gifodesad.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/bijelodemapowinorixas.pdfIn PDF document text
    • http://snsi.jp/image/news_file/xizes.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/sivowekazepake.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141cac7d4045---92583201915.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/37162420693.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/degeg.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/sotutovobamex.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fe26e65b---80061332174.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/14044182475.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7ee839283---3854135416.pdfIn PDF document text
    • http://bienbao.org/uploads/files/zemasojivuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=streets+of+rage+2+mod+apkPDF 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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 15604 bytes
SHA-256: e269099934becd711935097b6c4cc7355a702fe3cc0ba92614865acb70cf95fa
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10888 bytes
SHA-256: f230f52a1b70079b73e8d02d0c552c6b0e35dfe553ed7c03a3f6683638084586
font_02_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1