Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e343b214480158…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 07:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3401f306f4b26bd7be77b7f21dd2277 SHA-1: 3afd1fa124b7289d5f74fc5218b150750986078e SHA-256: a4e343b2144801583cb631ff03f80ad2eda12d04df9392bae4857a546518e04b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=2019+goals+list+pdf PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/26cd3f6edcfd7f60d7e9a40c907444bc/fijozivosugaranejasoveveb.pdfIn PDF document text
    • http://teifsepahan.com/files/file/8621721030.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/57197047506.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210814_4B2DCC07964E3D71.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/97627647006.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/54778112828.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/67990244654.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/xukunumuzaxivipijimij.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5430a79650ab6d9a8d80ae45feea0bfb/fonuvidolugo.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/52012388221.pdfIn PDF document text
    • http://grupophi.es/uploads/files/momunixukepofuzazi.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210826_081938.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lonujunovafetug.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d72e0861c---faruboxigoteraxuwubinus.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9014711278a39b50353f6d793fea301f/zuwitoguvujadev.pdfIn PDF document text
    • https://doitoutdoorz.com/file/azwvD1xsRgvp2CIy.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829c47a57f6---64338931264.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vunifevilod.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/fukafitemajanibili.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/33090759438.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/pesavas.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5921180c93---38435774386.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/botozegekaruwopuvagi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2e951747528513c97d81630b69f4de20/57331597238.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bunimuf.pdfIn PDF document text
    • http://consade.com/userfiles/file/narodavafo.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/detaroxoredufabuf.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/729813377.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10704 bytes
SHA-256: 96a89b1547d82cb687914fb246516aa436c764d41773e7105cea40e3c8991e71
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 17520 bytes
SHA-256: 2f8c51a88ac15565b17bba44efdb88dd51b044b0939d5a4ff65591fb13460b44
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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