Malicious PDF — malware analysis report

Static analysis result for SHA-256 4804e90fe8f08d6d…

MALICIOUS

PDF

93.9 KB Created: 2021-06-20 19:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: eb544962f29647b517eb5ebbe20fccd3 SHA-1: afd3649bfc81b971f7ea06cb3ac18a9e263a366a SHA-256: 4804e90fe8f08d6d2cc9235909467eacd398341cac29c357b46e616cd106654a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=phet+density+worksheet+answers PDF link annotation
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2b5c9e5b4c4df651c2c25f1cd5d5d8b1/74642507878.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/fn9fg47lg57irk4pjocp6elqun/43662923354.pdfIn PDF document text
    • http://sparkpro.lv/content/file/2340324368.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbuljit89cuveid9k1t9plduda/27143045418.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m8iaq7uub31vo5c26j422eui1i/jozeretigajelonujitut.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cf19784ac---fefivetakemolin.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/17916487700.pdfIn PDF document text
    • http://jarosi.hu/files/file/risotoveze.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/bewixux.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file/%5C/pimubuxosejata.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105010002337931.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06aa6c463---64422013331.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/xazowadi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad8618979---ruzonexukaxutifozadira.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc49c1c83b---tekokajiwejiwesogobapof.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/4af8ca018e98f31bf2182f51713b4fd2/viwalupisitofefovivowu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/popudunoliwolejufafekikam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://phet.colorado.edu/en/simulation/densityIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 4928 bytes
SHA-256: 5bb118783b2c23c08212078d33ee0442bb2e05127ed1c18fc5dc8c1abbc65c31
font_01_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 11716 bytes
SHA-256: d703a6a9698c8f35981953becb92ba386da4234ffd9f587db2a51d44d2224b23
font_02_sfnt_off0001453b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453B 16184 bytes
SHA-256: 26aa2ab8381899593b5c29fabc4f8b0211db2d1873ea1b4cf8f549d9b28ef981
font_03_sfnt_off00015a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A68 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.