Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d231beea05f078c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 15:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 846e18d96f3519f9a1c05bf90c7af1f4 SHA-1: e6817d303bb321cabec11d30eedb975987dd32d7 SHA-256: 9d231beea05f078cdb3023a600f1ddce1978bb0a88d87c572e83adb0f2a4196d
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, and the heuristics point to a technique often used for SEO poisoning or phishing lures. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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://www.injamal.es/nueva/ckfinder/userfiles/files/13034012159.pdf In PDF document text
    • http://belean.pl/userfiles/file/tevilodenef.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/puzibimo.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/tanedifodame.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j3pvsfub3opj6vqhpaq0tvi51h/91173482332.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/fowikew.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/falifafosoberor.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed4bd7dfd---jowibex.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/77003823455.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/bipidow.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210914_090418.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/62077475225.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/51290827363.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/japuxi.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/94304321384.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b8683cff3a86fd2ee3706301084b519e/91450353448.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4af376ea---tevejikejemasazeromevid.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nawufawuram.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/zorunafivededa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413da7421c2---wufoxivorumokiwa.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/32049771233.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/muwotevoxoxumema.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/tukemepenek.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/28101372281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=find+android+phone+ip+addressPDF 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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 10320 bytes
SHA-256: 1d878f9bc7cd0b6c701f35638525620a50af133efee3fd9f729866999107566b
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16884 bytes
SHA-256: 8451c804ecd175ecbdc688d29b04866d67cca0c89bd7c217645e50e885cc8392

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