Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7d82802cf087f9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 06:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a6e6287928a2a610255fd5082b1cde5 SHA-1: 14a8c742c2060a62dd32fcfa694f1780f866581a SHA-256: 9e7d82802cf087f9e6dc50256ace07765432b6bdd991c3d35010a72ec2cd5e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=aw+free+video+calls+and+chat PDF link annotation
    • https://thietbidiensino.vn/media/ftp/file/wurisamimazuvarewujolad.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/nupikuwaw.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34608872476.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/45906007385.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/33878b943cbc446d07c57866dc10995a/82176478537.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/suvizexowavemewipuf.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/59d1137d334a40e5f265c13219ae17a4/taxasimugikigufakikoz.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/difiwikejopodivuvivuk.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/13836366814.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd2e5de3d---daboxeken.pdfIn PDF document text
    • http://technocom.pl/editor/file/lituxorozewen.pdfIn PDF document text
    • http://xhzhengli.com/upload/12485958611.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42db9d82c---gitov.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/9985465014.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/resibisepabozukomeboguzor.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/67264325411.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/73011762046.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/r6hji7g4ikkhku5afnig1nbjm0/rasimujato.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/78142467453.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/83425081288.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/warenewozonuvetipobi.pdfIn PDF document text
    • http://asqcert.net/files/files/41609099497.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb47a93480---zuwumonosejorufibi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16146057b8352f---17296428687.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_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 10708 bytes
SHA-256: 8f077356f2e459e0e057f9aecf6e1420fa76ba35975adcfcc2ffb5fb43133601
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 17936 bytes
SHA-256: 65feab0bc27664e561dddbf8e1edce0cfce3d9e69bbb8402e5f998fe3cfb06ab
font_02_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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