Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dbf19364a6528d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 03:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 169b50cb63b06a23b25bd5234f64b092 SHA-1: 61cae4eb05827d36ee630c92e47bc0e5b299b685 SHA-256: e6dbf19364a6528d3c6a9780282501c56d9a9228e3db5caef6abc954544444c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zopos.zohukum.com/ckfinder/userfiles/files/83455924842.pdf In PDF document text
    • http://wsp.pl/userfiles/file/toxukidunonakasolul.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/59795941081.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xupagezusisi.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/93383092310.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/77812660105.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xuwudipuvevidogez.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/81437464155.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/bakoluzamajuzuw.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/budaxuwukupotuzesipuvini.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136afc7bb310---pidavajapamorisiwibixixug.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/73784624428.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/tetinepimanupasukeza.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/joguwomito.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/xusexuzemado.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/96106119865.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/19609378762.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9022653eb6c0de06707c4962a918b384/kaxolu.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/jumowarudedirifufe.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/v0i269e8adb48e7lt4i595abom/xugutikogejibutuso.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/22096306960.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/22221282959.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/94975414569.pdfIn PDF document text
    • https://geniodelweb.com/file/wexivel.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/pefurulop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sega+game+android+free+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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 15040 bytes
SHA-256: 5610cf2c2c4a1eac88129c729745ab40c1792db0612196c8051d4a8bd284093d
font_01_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10592 bytes
SHA-256: b3846a0df4b9679813241acf1f3d3a7a798c631b417f2072290356ee68029c2d
font_02_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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