Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfc40587252e636…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 15:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cbf47b24f4dd9d95c66da9d63581cd8 SHA-1: 29f3092be882d12fbe86bd1f3f8e5b3bf44f8222 SHA-256: dcfc40587252e63625240e2dd1c7c052224f2c13f68dd4bcd0c62ed02b76ba94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=azar+hack+ios+2020 PDF link annotation
    • https://nepalipublisher.com/ckfinder/userfiles/files/wetofetugulirig.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f104b93d79---12542787368.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/70096566137.pdfIn PDF document text
    • https://jss-moms.si/upload/File/49108967473.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/33712745971.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/47100727299.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tutaga.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/98405164510.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/86681039541.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/gekir.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109101145534487.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141659e2d977---fuzabigekixekulole.pdfIn PDF document text
    • https://angkalaris.com/contents/files/gugezeju.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49460857389.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/midajabilosizowozidan.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0d50cd7286903e0625a303a0b6319d7d/86121175938.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/65455452491.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/04527bb38594338e88d372837ce1d98c/vusewemipabumi.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/mutowuvemagugiteketomop.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/jomeninilugejupubizikuxo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd946d9537---vefazapidagan.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/57690763870.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/30791483845.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a0732da86022551a3b81b758c599847d/89607561293.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/mutafasakixo.pdfIn PDF document text
    • 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_off0000b754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB754 10324 bytes
SHA-256: c2dadee667c33fce1253a4c44e5ad8f548aecd9765685f41c0755a6a8138e84b
font_01_sfnt_off0000cee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE0 17320 bytes
SHA-256: aa8d7d9b3adace7d0bc01e650f5cc6f2de1349b5ad44ca44f6d116cb84c21950
font_02_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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