Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb85444d911ff300…

MALICIOUS

PDF

190.6 KB Created: 2021-07-02 08:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b62c30e3bacd4bc85ef6c4c31b13d0c7 SHA-1: b9f5ea7996cfa21a3d552f2a7e5b6d5bb80b6c52 SHA-256: cb85444d911ff30058509f6ebb1847bd6afd54eede8a7e06d9db7baa9e511515
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/52fb5591f858f5fd8c6e00441e0398b7/bunobapaluteruziwu.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f36fb6e17---pisenegimaziravorolaj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dceda176b---japasemupaburapisap.pdfIn PDF document text
    • http://come2menorca.com/images/file/werejunomitarosibirar.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210522120311.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16071993d05499---savebosajariz.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/1c5547e5a683532828395fb1d5cbaa44/46245601624.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/927aaf45908295caf38e4688b8586b2d/89022915571.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1ln7vss42g71iqg0h7lu96j615/9253780271.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/febugitu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dexoxijekoxobekizazudigi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8f69ba1fc0c4fefa2a5cacfb09272eac/bumizeralesezusewamu.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/74720755393.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/18409088292.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/bbb5915e668added4973ed7e55b2892e/jisugamosudasoxonudivap.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350a4be4db---xunesazefitobigamiwovafu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/bb92ccb6029d512b5307e0b7188c799d/fetutojataleto.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/gasorivenazurawajexoriz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a73a0e34---kibomumajukiwinud.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/fivigonaboxileruwifeki.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a000ec577---wibexawubasemafege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=average+household+income+hinsdale+ilPDF 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_off0002888c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2888C 18704 bytes
SHA-256: 327096615a7992d31be16a7819a063d0332339e221ccd36dec7c14e68f81bd0b
font_01_sfnt_off0002ba6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA6C 10868 bytes
SHA-256: cc42a40a353a734ddc64a8feffd1161de12821ae96feb5b60f2ab361fa48e698
font_02_sfnt_off0002d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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