Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5235a855c886127…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 14:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46db341878808767b7bf2fe03ca3a159 SHA-1: be054847fac1cb990176fd31cbd9153c662ed6d3 SHA-256: e5235a855c886127f0bdad519cdc6fdcab84b3511bc0ae739d6f13aebca292dd
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131145564195---lidixa.pdf In PDF document text
    • http://m3hotels.com/userfiles/file/fenogimigovuvefarax.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/7679480273.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/sirumaxali.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/nonenazunitaragapaxuse.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/jadomofajekakot.pdfIn PDF document text
    • https://rm-parketi.si/uploads/31856565149.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/27552727048.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/35495049988.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/tizebagojasuxad.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vimejerodutikuv.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc37972925---39418573685.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dekudapa.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/43487045816.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fatax.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/27634924924.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/84534585632.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/67d31e90a6185aa64d8b28b68cc13ee1/65675732861.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/52434554681.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/6990735148.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/43116609691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=indian+idol+sunnyPDF 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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10076 bytes
SHA-256: 0196eb854e1af325fc2f700e0b5dc38dd0f6f128bdafc44f7b7c17e5ce03584e
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 18144 bytes
SHA-256: 7d49cc07531d74a32b474a9c765bb18c0291d78fc5994ef08a8bde2df4dc3fa9
font_02_sfnt_off000130fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1