Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc89233b44c4dea9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 10:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 594f731cc71c4e7dedc288d756deec78 SHA-1: 4a840fb361192efe85e3c98cd0be8b2bc7b11a5c SHA-256: bc89233b44c4dea9d06ecd5ecfbdbe32c0840427bdefea4f4d2461e11459dd5c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the classification as a link farm, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=bible+verses+about+being+baptized PDF link annotation
    • https://pingthye.com/userfiles/files/81896081312.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210728_D3586BAAF4E24B24.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/24b5aaaf5d428f5ef25ff4d5945dd35a/11293005998.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fokox.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc41190b6f---68171364382.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/bulufetujuvunogonemufu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd9b9f083---mavonurigo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xufez.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9b1ed36c---mamemuwiborenusiwuwo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1903091a4---77077491169.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/10575819398.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737bcd158f5---31309796511.pdfIn PDF document text
    • http://zae.me/datafiles/file/44174719430.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7640fc0bc4fe966bead2c38b05231f4d/dezemijuxosowunawoxe.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/nekopeferarebojolunedavi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ea6b03ac---salopisoniwolokovolimoniz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff892a846c---99606593634.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-2/20210802012117448630.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5524889b19033907060df657541f48c0/moripef.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k1f7lvmjnrr7l1q6f35d3h0rvv/34086775145.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6191eef5c3---17988876905.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/wilibikatato.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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 17788 bytes
SHA-256: 87d5f1207353a71a1c8d7686df17603aa5d175da0e45129bc6ae85e416dcfaec
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 10984 bytes
SHA-256: cddbb01f2d3b207a6697eee2e351b467c4d627d260799b212e510af504e68463

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