Malicious PDF — malware analysis report

Static analysis result for SHA-256 d236449aef152378…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 02:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11f22e7743b9047236e167276a89ff93 SHA-1: 4c0197a3ec254632bbe6999d66283952815ac207 SHA-256: d236449aef152378d896fb166f3158241946a89d608270411e770017f4ca529d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f55468d8701---22688303185.pdf In PDF document text
    • https://selispin.com/calisma2/files/uploads/68239530756.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/bogigopad.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d78f90d71e6b97c0bf10bd7ee7dbd249/86599240431.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/vabex.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b135283eb42.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/984ae9a4e3caa82b984accde3b1b2ffa/3011424153.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/30096305443.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75488bb52---koxagure.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7858c9539015a529a5e9e29edf1d7c71/wosepamiweda.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e22d715d92b---simazijasipujeromixigux.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/15663500601.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/jigepadifebosufitofe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805c79d438e---23671421127.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/16i192vli1984p7tib1gseeekl/wazakuzomirevuzibiwililor.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60eaaca494---66234013561.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/33703615056.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/35459120959.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/pabekofivefavonujali.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/fo4v4671v5avi327hj77csailp/90304414178.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/14377206917.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b11d04857---nasirotinavemudebewivuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aranyak+by+bibhutibhushan+bandopadhyay+pdf+downloadPDF 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_off0000af4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 15356 bytes
SHA-256: 1ed0a32c86121d8be45850f5557dd9126b897138e77b985546511e5795cb1c54
font_02_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10976 bytes
SHA-256: 10e300b710f3eeed4cbe0b8c311a4614c4c724bf1271e258bb0530969d67618d

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