Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71a96ed9f06c380…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 10:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1959de4ffafe2501eb3a4fcef4d27d21 SHA-1: a9bb1b3db9b9976d0bcd56e3b5afb1703c914f27 SHA-256: e71a96ed9f06c380c1119760db1a6f646bc63f7106de53c81860a2b4c3189a65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains an embedded JavaScript stream and a large number of external URLs, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pistant.ru/uplcv?utm_term=indian+train+simulator+2019+mod+apk+everything+unlocked PDF link annotation
    • http://kammatrans.com/userfiles/files/resazadiwe.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/68078502204.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/30317870742.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/xetada.pdfIn PDF document text
    • http://kleiberit.ru/files/file/49435229723.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/79547080714.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/zekizazolinafem.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326205e872f---defotulenusuvizebaw.pdfIn PDF document text
    • http://ewtch.com/upload/files/kotunosenatakovo.pdfIn PDF document text
    • http://origo.ws/userfiles/file/gabosubadoxavasexekuso.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/seludajef.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/zumubo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0d863b49---xawumuzosopotipuwivew.pdfIn PDF document text
    • https://loyd.rs/images/file/86848493826.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/73014236737.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea3abb28f---foxisejidifa.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xijerisololiroluf.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/rajofufovobelexefonepi.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/82578590982.pdfIn PDF document text
    • https://afma.pt/site/upload/file/nakexiwusidajukejewur.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc6e99d062e4a9b93250694232e8d5d6/17182865929.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/30394185571.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/xopav.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/25942968440.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/namal.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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 17124 bytes
SHA-256: 22de46afb9bba186fe10836202aa9138d0098689aeb68cecf3f80bc95134d517
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 11748 bytes
SHA-256: 0efe6e8245a764beb4e5bf0ddb620de30cf9f6b1211d36c90446956183ae1879

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