Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54c85a7538d8d05…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 19:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0468d2283216cbbe00dde2f152cc2c5 SHA-1: e4b0958bc29a02104dea9327452ab61c88c00cae SHA-256: c54c85a7538d8d054f59bd4c9568ec2df8d819672177ece61ffe7d79e1135337
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=how+to+recover+instagram+chat PDF link annotation
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b6327171d7428a937f26fce6b76a5070/70772840307.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f47cb5d332---21703870497.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db788104f61---rurazara.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/oqbm32u5tpmcvodhojqa05s9s8/bifiburufaparuw.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/kipokonuvimuwojifiviwuzaj.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/rerobewopidokixoj.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/wasopodux.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/79540830883.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9cb1baf0---kakeba.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c376f513e54a1e7263d9724537593fb2/juderamubesedutudi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hh9e48i2crln0dch9fkj3e8e8t/zobabasibenarotajo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/13878787749.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/vaxijesujatazu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c198b2444---perozi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2045a54e---18180620216.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/5396824335.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fesubovosuk.pdfIn PDF document text
    • http://stl-hk.net/userfiles/24219122596.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/76299531852.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kevakoderasiwifapisaleki.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/29a34003e0cb11b8e1283e32b36d372c/senugomigu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e7a295cec7388b02938cf46bc7ee7ca3/gipiduxuwutezowen.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/9709816421.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/eabaac37d88a032b827996a2663f253d/76514608020.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/56861048399.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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 10772 bytes
SHA-256: 2ac3f5c2cad144a5797672440af258bcb8c94fc8072d0c6c752583b23b6b1aa8
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 16876 bytes
SHA-256: 9d0786cb171b1c9ae069481f1a8f519a743dd631df825e853bea38d73459a901
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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