Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10304efd4de028b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 20:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd4fac1c377d2ae884ca1159bb42385a SHA-1: a0164b38f40adb58cd81170fcffeac8b01421bca SHA-256: d10304efd4de028bcc00275f38f5bb2d14255d4d27ca6ef5af679c6eab901cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=data+structures+and+algorithms+made+easy+in+java+karumanchi+pdf PDF link annotation
    • https://monamifrance.com/FileData/ckfinder/files/20210702_F9531E55AE7137ED.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2bec215bbb61eb1673b30d39d548fc1f/zokaxatojumuzuletag.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc359c85d---16756160926.pdfIn PDF document text
    • http://deauville.ru/files/file/tenoguwepoxe.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/nefoxuriror.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/edc3folvp8mv10s9ahcbss6p75/rakedukeledutor.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210606193602.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/likeseroteluxafalinod.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/menapazowujuzaw.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/zewitanomunosowaza.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/visekodi.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/85044175536.pdfIn PDF document text
    • http://tms-operation.com/upload/files/23943354108.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f8eda7ecd53c2d570b6aa339bd8b98b6/nerini.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4ntk50up3k3jjg9akbbmsqj3l5/wutoviliritakamevamiji.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/nusojowatuzugudin.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d4cb7174---95023716561.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b22ed8ba112---19505859082.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/raputi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0290f3e263---lilejotopuv.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 11572 bytes
SHA-256: 4e2a7c9bc241d05bc20a7a6f5613a2cf9ec823bad9f08afc2b6ccb36554aafb9
font_01_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 17404 bytes
SHA-256: 06241563384aec4e49e0d4ce3d7861ff9e28d3fdc6a96834a2a462ba30ec424e
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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