Malicious PDF — malware analysis report

Static analysis result for SHA-256 1830cac455a0f16a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 23:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 15254de8aa15174268a509d76cb486d3 SHA-1: cbcf3e9fdd361a687d2a9cd1f520da92f99f9aff SHA-256: 1830cac455a0f16a7d2d38da74515d18118f9b9422d0f2c34d21ad2ab1ff76bc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=grafomaniatics+maria+fernanda+centeno+pdf PDF link annotation
    • https://macjiboter.macjahisa.si/files/file/92299153582.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/duxuxizene.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109102252428746.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/xemusiv.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/77649157821.pdfIn PDF document text
    • https://wittnebel.dk/file/teluxubupeni.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/23398799811.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42446019980.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/76731689313.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27083709908.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/lexusis.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/junise.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/51881570533.pdfIn PDF document text
    • http://machulski.com/public/file/72650899936.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/44923821602.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ananfgcvcr0qn6gv5flbbj6kr5/kurukevaga.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/97676856348.pdfIn PDF document text
    • http://dsagco.com/Upload/file/62500546001.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/64015673349.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/99169928295.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/jamemukud.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/9608058480.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pm040atic8hs9feroq3gclbb57/foruwuvapopimotej.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77706491123.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m6kb2racf8aqivp88j6fak13k3/bavibazo.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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10776 bytes
SHA-256: b6a3d3e013ae265a215a0d12511426d9d761277f96777420daaab551a0c85838
font_02_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 18724 bytes
SHA-256: 6b3111e30804ce11bb89744a07586657ce003c62c57efc9929cc4c4017d0e682

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