Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ea2c380e83d300…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 03:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c20fee1fc745826c049af4e678d34c41 SHA-1: 22d3b7710b4998f8ac979d80beffa124cb35535a SHA-256: 65ea2c380e83d300f3b7fb0cbf50ab6dd548d94911a3d10cb986e482ec811dd4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ipceurope.be/assets/file/37623507587.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5560c7a6---wejusojowutaxidigejomori.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/200760b2dff172f67550400961e1b291/53306594070.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/96118407093.pdfIn PDF document text
    • http://vucert.vn/uploads/files/rimutodisami.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3e50cae9---gedaxoxofovemaxopuzovozi.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/34580483818.pdfIn PDF document text
    • https://tonitomov.com/picture/file/88895792947.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7cddc029a---rujobuded.pdfIn PDF document text
    • http://jarosi.hu/files/file/xigiruzaxegonineba.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/71623578018.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/862729df8010510502a7dc27bb02b15c/waterosedivapidenopab.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fenoxigulor.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/tizorevewubej.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/deledaligu.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zufesezupo.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/89989671386.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/68d72f89046a1f1c062355c4478cc525/80973521020.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/31436700167.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/mojedozujujiji.pdfIn PDF document text
    • http://co-mit.com/uploads/files/8360604646.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/wogudujorilojunovazunanix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+hindu+chennai+epaper+pdfPDF 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_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 17224 bytes
SHA-256: e1795743f4824e17ea817183459c2bcb810595c2ed3b244d5a6fcd84526c5c67
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10348 bytes
SHA-256: 86e034cd60b425c4451f33473028ee7cb46140456fc6bddc13fafbf481723a61

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