Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54b4611ffb8c5bc…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e7e181a94fd22a87e14128c6aba5d705 SHA-1: bf62fa230451b8887469503441c674cc283bb33e SHA-256: d54b4611ffb8c5bc8d718ceaf465646355c3c6efb7121a798da07ef458e034d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=how+to+unlock+password+of+applock PDF link annotation
    • http://laarakkers.com/ckfinder/userfiles/files/mawiwa.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/mavuxajitaduribato.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210903_1DD372FEA7AA5328.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d641e1edd9c309d2d7aed5dcd66d8713/40838914613.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gokaxasovonijufoliretaz.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/50539992455.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/31814159920.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/benerom.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49860208535.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zubejugasiv.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e82464bfba---gesazusedabopozunopev.pdfIn PDF document text
    • https://mfdesign.hu/files/file/67428004475.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/nudavolox.pdfIn PDF document text
    • http://cozyboutiquecruise.com/upload/fck/file/40129623357.pdfIn PDF document text
    • http://domuran.pl/files/file/loribonerisowawarujeduj.pdfIn PDF document text
    • http://lobi.md/userfiles/file/10211268429.pdfIn PDF document text
    • http://keitbg.com/images/files/95842931939.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/11878220857.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/jogiloluluweg.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/77190737011.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/5554404810.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/73561516208.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/sevirenirilalikufoxoz.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3a61846d8---nerem.pdfIn PDF document text
    • 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_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 10656 bytes
SHA-256: 2dd9d521330d4f5f67410662761f22d3fbb50b384a0d01120900b105e1a073d5
font_01_sfnt_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 18900 bytes
SHA-256: 30444c432834de0a05fd6d21ed343540441bf7d54c9fe621ad992a583c6a43b5

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