Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2e61556a56c1df…

MALICIOUS

PDF

77.2 KB Created: 2021-08-29 14:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a4cc678f6ad09454974cf94d42b50f5 SHA-1: a610e6076c6b0654aab7cf6356c61122ccd0a447 SHA-256: 4e2e61556a56c1df4212ee7fb6fedc072760e70704f5b0e5916242ba51cfbb89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of these links suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://moreit.ch/productinfo/file/vepejunibekojuzi.pdf In PDF document text
    • http://didula.com/img/file/74917908490.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/73553631629.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wageviza.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3800d467d---68791439792.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/96745428299.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/46855325541.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vosuzididixinago.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/lexiwogiriwusani.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/foxera.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kdtt3tk0liu3kicn6ke6p221e4/fozolakagupusefaju.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/256b9dc5ba887c7460dffbece42edecc/55145983251.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f3e1920cf781c28ddfc129e99f2fa7a2/32238809806.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/24951389077.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0846b661ca---nipej.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/783pb2fhtegjgou4ft9pqpofo1/21976168800.pdfIn PDF document text
    • https://andana.us/files/files/dixov.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8629f77983d519f29c63d3bc75b16fa4/91084396402.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/45c9056b8139e0571cfd2997f37784be/12188641603.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/36655679278.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/dilibixibebisanarotivevis.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64009102950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=winchester+discovery+centrePDF 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_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 17764 bytes
SHA-256: 6c80994ff60a4faea8156eab188ccb908471122efb3929189b80d96eca4d54a5
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 10432 bytes
SHA-256: e46792b00f57cbc38a030332a3d6ad79af38de15e1e90a82e0ebee8bcc431e1d