Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cf428c8232bff7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 01:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6817f404567d06d00c98350e7bd4df2a SHA-1: 120129cd023d2d93641e0ad40d462bc39d86b8df SHA-256: 21cf428c8232bff74fbc123b2248e0960a17cc63ac88006003580ff45051b2ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://elvirajogsi.hu/ckfinder/userfiles/files/jukasok.pdf In PDF document text
    • https://toananhmedical.com/uploads/files/viximegosekalalizofafutis.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/rogasibaxirumeribenej.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16149fb636e491---rizitidoxusamuton.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/nelurelukapu.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/80577756230.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/86411452883.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/28459122199.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/66706088902.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7uuob4a973f6tvm6i2ugh72bc6/fokugobizugebigeresa.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/zagofasifolodasazu.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/sukapajurig.pdfIn PDF document text
    • http://xn-----elcksuhhemsi4e.xn--p1ai/files/files/mekipedupaxowizapifanaj.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ad667662cc19f05fd78eccc4f0f09a3a/vofonesisutuguzimigitima.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/78252505760.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/29518055650.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/89144286839.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/kagamufo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0c7267f4da6a9231131f78bc99dd7e1c/juteruzixus.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/xonefinewazisorata.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/2516327211.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/dafikamunovubiluxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=turboprop+flight+simulator+mod+apk+new+versionPDF 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_off0000af20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF20 11392 bytes
SHA-256: 4928ac19ff7af6886297b010bfb2e51cf7ef171cf04a3e38247393ec501c4a64
font_01_sfnt_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 15928 bytes
SHA-256: 4ac1294bf076027500a3a9f2e64a2cb16942dd83b3947ff643a65f9f5042db2c