Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba12a00a43c6a6e…

MALICIOUS

PDF

94.4 KB Created: 2021-08-30 17:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af32cc636916c5b724db1de31731230f SHA-1: 05529f9faeb34f0fb10a6f8d3a51dd978a07ca03 SHA-256: 4ba12a00a43c6a6ef99632141133cdd7414a04f75f7cacb5e868260e87b08790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress upload storage and other disposable hosting sites, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://crysiq.ru/uplcv?utm_term=bowie+it%27s+too+late PDF link annotation
    • http://www.ecostroyservis.ru/File/65660351495.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/sazezamevabutukaja.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/82176099.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84529496001.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b2752dfe---nuzidapulot.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/bakilojubuzom.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/62117887528.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/70678648182.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/80216220143.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/47f3290e032ef2fdfc73fd506f24cab5/sizawabuzejabekenufu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210821_A7CDA71280033B10.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/78838f9ab5ee2e7cee00f27d6a540e05/82920789187.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ek4dtii75rgi1ggl73go59gjb3/zewolavejekemojemuri.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c448d46b---74670077423.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7c13e0dc214d08d8c4d4e96350c475e1/jexifotujavog.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdb84db09---tololomorojawat.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/83941443236.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/760d367144cc25897475a0960dd38ca8/fipufijoxajuwufefiz.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2b382e492e47d85c2865234d9e4659a1/96700683774.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16079031a628f5---87345292768.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/62120911823.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cf990350127296c219fd117a967f3622/lakometomuwudetafim.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1755e9c3fe0cb8c6dde9082d95467b6b/jizurelevakewimoromarusa.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2963a76a51fe85435323fddbf755ed15/97251796648.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/46255cf329f961208a0e859a271b5201/perizuxavozuzavadiwej.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609130e19bfc3---56399603722.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_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10072 bytes
SHA-256: 8aa5426176d7aa830559b8720610b0171bbcc46c913672febbb174dce235f182
font_01_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 18068 bytes
SHA-256: a154b173be78d4d49c7a31cd3b4c3e0596e8ebe7975f9de868e39b7ca0b0fced

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