Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6ecd4d869e1a65…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 10:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbf4d9e30b92f163a2a6fe5c5a6e0e66 SHA-1: 37008987538ad92e20a9dc8a84da9b2a2ee0cdc0 SHA-256: eb6ecd4d869e1a659bf7bb359c7b10f00295c222eb964439a4a1cc8dcf587516
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a coordinated effort to distribute malicious content. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ttccid.com/userfiles/file/97197610920.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a298e247491a5f9e22676ecf87f38200/kexatewajirasufozipep.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/42240240552.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/57822259223.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/zomamuz.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rofujumuga.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/43135210202.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/wewazetosuzido.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/merusasemowu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fku739ndvr61aeif10oouq9env/27111614729.pdfIn PDF document text
    • https://reha.bg/content/upload/file/zokikuzox.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/ginipotitixit.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/sedukoxevasevebajike.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131727cb31ee---laleta.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l182go6lisph9ipc0j0jrqh0t4/nafofikowatefim.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192915265189.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/90744133692.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/7967233340.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/85018999613.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd413307f---xubim.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/wajisetofuvukaw.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/rukugaleg.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/lavisetonagedesaxo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a4a8b8e4cad3bc2648ab55586bcf8db2/16668795986.pdfIn PDF document text
    • https://clove7.com/userfiles/file/11411680648.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/78588587875.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/puahkt6hpl1cdlkantdgst9kss/sexuwukumojavola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+h+and+k+in+quadratic+equationPDF 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_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 10776 bytes
SHA-256: e150c8036d6d51a65f30ddb38acfef3c892ae2d8940404e08a0fd5dfce795a3e
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 16972 bytes
SHA-256: 90c8aa090115b7d564b87274c777e7402cf90d4d58e6e3b5384a89c475b013a4
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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