Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf31df4d45c2373…

MALICIOUS

PDF

72.9 KB Created: 2021-09-10 09:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9113c11efefc311f0f09205bf1ab309 SHA-1: aba3d563e9c5a38755fb7f898edea338ba835584 SHA-256: eaf31df4d45c23738bca97a35c39c6baca0ba83d8382fa9bad7be8e8809e85a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://vinhthuanvietnam.com/upload/files/nizilaverizofudasi.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359d6fefa88---48345276486.pdfIn PDF document text
    • http://espokebar.com/uploads/files/kawebadixenazirub.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/galipofimadasurikafoleki.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/22572862765.pdfIn PDF document text
    • http://airfa.it/userfiles/file/10261276015.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/jexifonadose.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/sipuborafinuzitena.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/dadosi.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/15725775427.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fosunarixem.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefe367e8a---25331709490.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/39830664104.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/dufixa.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49449195310.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a539bc394d---25508935517.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ggmc2l6tn55l1u3oqbd8a0a7d7/73091551881.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/nuvonodulakagevurekeva.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sugedunekenuv.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23324800922.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/94610350975.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/wujefununekigosiw.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/92059671344.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kowozuwosonunadexiwido.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613992f7120dc---xatate.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/vulakajanunijuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=coc+th+14+update+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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 10596 bytes
SHA-256: aa6cc4a888d3a08b8c57c894b7f2e0c4dc5d987faeb9bd328b2babf3776f9075
font_01_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 16448 bytes
SHA-256: 02cf25b181c866ddca4bcdbd77454767929febce46022d1112b2d405b093616e