Malicious PDF — malware analysis report

Static analysis result for SHA-256 0901c0357f629d39…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 13:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfbc4f6df4f2de9aa4a63028df8869d2 SHA-1: 5a6eda57080056b626aa6735c67c62a202f60419 SHA-256: 0901c0357f629d392114c7fe7f2d1e7dd9ed0c5448cfd72a829572627484d4a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The heuristics indicate a pattern of using compromised CMS uploads and disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4ecc8380---46365083362.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d3eec1c5---bokajijolawerurovanazatuj.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/063cou2asb9lu2es2iff5es810/zezekevevi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612374cd69da0---kaxerapawaxo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/5517818601.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210613005023_ix30sg.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805a68aafa6---80594941809.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/44885865529.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4c1111ffe57dea78899341a36a17d08f/93850382972.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f705e47014ff97d7c4ff0f45ce778795/bozakofakegolopamunegalez.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/rovijukipivinedev.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1628128979_1.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a1b9fdfa5283ed93aa88c5cd7f976002/somosipulet.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6f5778ea---49801427816.pdfIn PDF document text
    • https://khanikango.in/file/padamunuvumexikofum.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b2baa539---68480553880.pdfIn PDF document text
    • http://hotechike.com/files/files/87854055429.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52153950ed---92897233609.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/19152011314.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/xefoguzowivodoxub.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/maxapitagosoradodusebosu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/jokitifa.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/81357128545.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072f27ddfcc6---vewoperonopufunepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rate+law+for+decomposition+of+h2o2PDF link annotation
    • 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_off0000bdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCF 11136 bytes
SHA-256: b6f6a7b5256260257b886ba46658762508b381a20614a59a054cc9abfbae4095
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 15536 bytes
SHA-256: a9693718ea554e115e878fc08658893f3fc6c5205c6d8e0ac765ea8aa6e462f9
font_02_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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