Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29f0981b0bb742a…

MALICIOUS

PDF

91.4 KB Created: 2021-07-31 01:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31c6bf0090614b1a3b0a92ebda58440f SHA-1: 778a43237dff38cd4904e086456438343f5598e5 SHA-256: c29f0981b0bb742abdd821b8b4ac8af1f735417646c0d3190490a1d16808432b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised CMS platforms or disposable domains, points to a phishing or malware distribution scheme. The document likely exploits a PDF vulnerability to execute its payload, hence the inclusion of T1203.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=does+the+ifruit+app+still+work PDF link annotation
    • http://elfuklid.cz/foto/Image/file/vexonopefosubovuvelenixi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f87ad76f0---fuxon.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c86de32f1ae---34452450447.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/8498186113.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e97dbc33b765fa9dd8e168e31dfd927b/52054386340.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/94ujf9ohtccenb851fkk313u8h/10891743076.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de533c0cb8---49404267.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b3d20ee7---xamegulawakidisopozafe.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/fuzemexadutifenozigezalob.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6159b4e9770f9a4345f249e6ce24ef84/pozobilodaregofa.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fd526bfe---ximelelugidoti.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6lq66kfue62kkhbe9dj83tkjkj/letego.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/78752345302.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cb24c9bef5---japetapudexidemixo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eac4c58fb---15344733818.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/mafuruzotibezajapo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/40477452871.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-15/20210615015458183507.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/minuluditosor.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3a556ba0bd6b9700f72d49006bf2fa97/34092348046.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/80816424049.pdfIn PDF document text
    • http://northcity.rs/slike/files/xupawobefoxan.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/12760305785.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/u8pva29rege00f55b26baoacuf/zojubebitatusuvezonu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a05469b0---tigijurenekozerazozalusa.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_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10628 bytes
SHA-256: 56b3d4a326690dee73f21629ec501c35de4b6f16574e01b593f3aa22368dc1fa
font_01_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 17020 bytes
SHA-256: b3df0ccaf76e1ea470faac76ea4cd823e17532544fc312111d367d8deb987b3a
font_02_sfnt_off00014666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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