Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18d078e464e057a…

MALICIOUS

PDF

87.3 KB Created: 2021-10-21 08:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1847c2ec1b6e467d83c13f1725a6eba5 SHA-1: f611d5e4ea21772558234ffc61dd9014327ba5e8 SHA-256: d18d078e464e057aee81c461782d7b56a11cb1eb805f36d8a131b9d73a228dce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pixomot.ru/uplcv?utm_term=how+many+hours+from+chicago+to+hawaii PDF link annotation
    • http://www.adarshvidhyasankul.org/userfilesfile/zaxaso.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/lelosegi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cf4dd12056---45046320310.pdfIn PDF document text
    • https://granitnet.hu/editor_up/wezokafeloxamok.pdfIn PDF document text
    • http://www.alitec.es/js/ckfinder/userfiles/files/senolajetekupokuz.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/kegepisobudokobenilam.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/36385755536.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/bokemomubumeresow.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kekelanilemut.pdfIn PDF document text
    • http://webursitet.org/Files/file/31005184307.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/devirizipivasejodilor.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/28987392709.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90816f11d---2150941397.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/30235833372.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/taderogumi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd3deecf8---59360016119.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/74595533593.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zirejitofupu.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/3438303652.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/zemewomenomanisevogibe.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee2ce1a9c7---76248186882.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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 10896 bytes
SHA-256: 97caca92306a4a3353142a506f042bb8b19bd9d0d4fea176a91db923d192c839
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 19452 bytes
SHA-256: 1800a85c3e2bb796c99f8766ee6e3ad6404b74755e6b1bf97c95f1ff331015cb