Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec56e7ea061eaa3a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 11:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee23a1359ca5537dde6052b6e015af98 SHA-1: 9b6efdb7f53275b93ac340471a0205655ded1a1a SHA-256: ec56e7ea061eaa3acf271fe3d8c9c719ee9df6d9f0ea6726014055a9e9f13384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The embedded URLs point to compromised CMS uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://elrey-uslugi.ru/media/file/jolikibonajagapoxobabofa.pdf In PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/88082407121.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/44637166706.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/15081397567.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07ae7b786---bibubewexomajevut.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/poopufc1liqevji393bvp1drm1/wureduw.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38143734399.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e2650a54---letiwu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/1075899138.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/puzole.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1e11e948---56792734093.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/14231656442.pdfIn PDF document text
    • https://mollis.rs/files/bolajetanalofejibuseg.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/56338775357.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/5b1882b2757474acc40e6965fba2c543.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/wapogomo.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/wafosajoresadugi.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/20484030441.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c5b11a18---78792191714.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/74335907996.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/xomikanopazigitalar.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/negusoxenozixu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/8390745992.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/43421996080.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9c60de0d894b6cec5789f412b7c379f4/wilojufumetotuxa.pdfIn PDF document text
    • https://davnosti.ru/upload/26261028966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tekken+tag+androidPDF 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_off0000c6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10264 bytes
SHA-256: 30cc003fae7dd649db181ff2419ff2592c637b3cfeae7743d2f2f134ed740947
font_02_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16684 bytes
SHA-256: bcc531e8f5ec4c83f13b89750089cdc7bad9e6e96fdcab6fca6c9c868a0f7fbc