Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45998a04c19f1f3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 06:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69ca9b742f2ee820cd5419237875533e SHA-1: feb6a6bab9dbf98698d0587399b519a4a3050f1b SHA-256: b45998a04c19f1f369153ba5e2b6c97edd69ccdae78a38cdbb2e521130eb085c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm of external URLs, many of which point to PDF files hosted on compromised WordPress sites or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a2e8af59ce3eda1c1206482fba2a206a/bobam.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/susezozoroloj.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/93556160303.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/vavubaxetigovibide.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/49785292688.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gudugalidigon.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/sogubavevetuni.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/gujus.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/ninatazagolazutakogu.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/9541658593.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6418bf1f---54217761484.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/31014496432.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323df49584a---30579008497.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/8281939466.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/wozevakiv.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/16961993692.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210908205048.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/62589932599.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139303666091---1817066200.pdfIn PDF document text
    • http://cjatkinson.com/userimages/rekarareze.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/sawavogufit.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/72232678302.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/9459833892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hotspot+premium+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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 10584 bytes
SHA-256: cb9158cf394fafbc9524a7bf2129c767d6768ac29e8dfddd6dde19708497403e
font_02_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 19224 bytes
SHA-256: 83626493c9116b3b836f320db85f17defb310e757338bf6efb013737cb989b4a

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