Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e824a6e62a4ce6…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 03:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb1f4c56c6ba8dbf2f4a39007d297068 SHA-1: 53c2ac692440351ade926f484b530efdff8e0de6 SHA-256: e6e824a6e62a4ce61dc6b956e5f92c44307d9462fce6b77a0e3d16f946c1fe50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The embedded JavaScript likely facilitates the redirection or further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=most+useful+android+apps+in+daily+life+for+students PDF link annotation
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/zanaki.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/nufalibepu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9df07a8cb4ce791be0e3d6a3e929d36e/75311600946.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/guwifaxiwefelanuze.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/448363669.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/xodozijetuwotemer.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/68496686426.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/38617879089.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/13345998604.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/66409724724.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4501c9fdc---43018858019.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/18737017581.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/32006383996.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5pnt8re781c7s0dqqbnma6mfi5/xuvapa.pdfIn PDF document text
    • http://orthopediedelft.eu/files/56855265926.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/fdb4fc316ef93027c92c7a4eb3504b68/28913146472.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/11702814037.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/24730582985.pdfIn PDF document text
    • https://ww170001.linebot.net/upfile/files/20210926105329.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/52287223039.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/dikozolixagewutis.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/rujevokobebaloturolafevi.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/vekilum.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_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 10696 bytes
SHA-256: 5515d4f412de716fac51e6a2dd4bbf6409b7794c4dc7f7543b74f6c3d3a0b421
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 17168 bytes
SHA-256: 0ff02e1cc0465b80060dc844cc8e217aaacaaa170ed97d7a492d7766c3548b55
font_02_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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