Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8461e2c84eb34b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 06:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84f3cdd3a40612dd50231247e9763532 SHA-1: 6ea26dae2735fafee55b99bf7f88a559857ee90d SHA-256: 7e8461e2c84eb34b267c1e968733899c57d1656e7156cfafa58b240960ed352f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links. Several heuristics indicate that the PDF is a link farm hosted on compromised or disposable domains, likely intended to lure victims to malicious content. The embedded JavaScript and the nature of the URLs suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=neha+kakkar+indian+idol+winner PDF link annotation
    • http://thermocomfort.ca/userfiles/file/10967986989.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/vubewuzugepeturogurew.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f311984b---57511296939.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/49898975401.pdfIn PDF document text
    • http://khocabien.com/uploads/files/82528857759.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vaweboj.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210905_161736.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/23206278635.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/31208396659.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/jazuxuludowozim.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/85580630700.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210908_000013.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199326149575.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/kivakuwo.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/movedupofubepiwalalegu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141692a5c66d---joxozomusidenevur.pdfIn PDF document text
    • http://orem.mn/uploads/files/tapemi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecc7f9a1e2---lojoduro.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/66338372590.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/68581796500.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/523887bf69dee462d29cbcf6f8b55ceb/juxoruduso.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/78052875068.pdfIn PDF document text
    • https://kaimano.it/file/52841935900.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/94c31ec3e508990eebe3c435f7a14807/suwegifixezitalewowab.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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 15784 bytes
SHA-256: ef3169a5927c42bcb3c695d35a9fc19e94123749df746d555a7706c36ee9fbef
font_02_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 10236 bytes
SHA-256: 490948ad79288686474efa76ce55352ff734ab2f6d6830d375c57b105800b0ad

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