Malicious PDF — malware analysis report

Static analysis result for SHA-256 389c03c6aa67ac87…

MALICIOUS

PDF

146.4 KB Created: 2021-09-08 20:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91824f86add43c8eede3b87bd525d95c SHA-1: 8e5ae3f05057c08d974b53f03fe93af2222e8c0b SHA-256: 389c03c6aa67ac87590054871dea4e1bd5178556f79b508f0ef5fdedd09b0de9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm designed to direct users to potentially compromised or malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jpsacademy.com/slbdavbatala/userfiles/file/87455377948.pdf In PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tilekiwovumowifadekidod.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/tivobitupiledobonanoma.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109011050213318.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/toxisiziwomusok.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/85226666441.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/jiros.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/99302194938.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/pozurarata.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/bagozabepogulefizuturir.pdfIn PDF document text
    • http://teledirk.com/d/files/dikekulavimoruvenirejop.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/27722476929.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/rolijodetitafaxumev.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161339d16dbc44---76780006059.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/remut.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138361bd5294---geketibupozomezo.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10479483644.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/83676680352.pdfIn PDF document text
    • http://cityfate.com/files/files/48380739500.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/86282575779.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b188d36dadf5b1031709d3729c274cfc/wuladajo.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/35982889737.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kitiranerevov.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/36231418779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=smith+wigglesworth+daily+devotional+pdfPDF 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_off0001d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7D8 19360 bytes
SHA-256: 7adc5a0bfd122cbee1ac243608e66af971eb01e3d6eac396a9a30bdb5e230b8f
font_01_sfnt_off000208fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22113 11284 bytes
SHA-256: ffc589c3e06c56483989afef65db5a1d083df5f1b85a2c1d0028e2156ba144ad