Malicious PDF — malware analysis report

Static analysis result for SHA-256 c261e28e6d4265fa…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 02:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 087df590e91e321054d0a6f7ea23a935 SHA-1: a7e1637485ced0cc54c027f1b58350b8de99b0b7 SHA-256: c261e28e6d4265fafa398e0123b7d12c51c5e2b3ba9a53021c865069179fc738
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://carsonpokebar.com/uploads/files/zuwulenibodotujezolojibe.pdf In PDF document text
    • http://balade-pierry.fr/userfiles/file/xagufotukipalivelov.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/xutirofiveza.pdfIn PDF document text
    • https://auto826.com/uploads/files/zezufutes.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb292bfabf---vugojewudamolevewepafol.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nosefofadifojozuw.pdfIn PDF document text
    • http://naso10.com/userData/board/file/merewekugewukojujad.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/zinexotoliguxogu.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/tebibipil.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/pitimogewililajar.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/30503886313.pdfIn PDF document text
    • http://huntland.hu/upload/file/36996293465.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/73220905244.pdfIn PDF document text
    • http://temple.mo/userfiles/file/revuribevulosomoxejatol.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/9888822198.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/69631503279.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/57367347736.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/846fc64bdc91ddcbbc9153d3957506a5/42580821862.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/senodewizigataxewa.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/10287691807.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/satakozijurejizuw.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/11693560777.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0ed9b5438cf04999ffea701037a340a6/saludulopuxelefelekejowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+sdk+missing+android+studioPDF 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_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 10584 bytes
SHA-256: 744205e9caab1838b2551f6e93dd836323acdafe28c3d36e40a8c7845b77ea4d
font_01_sfnt_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 15000 bytes
SHA-256: a9bc956796eb88a285bbd7a404a3fa0272c1fdd4d2dd68f0265796cca42b6555
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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