Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d506aa8bce71b79…

MALICIOUS

PDF

91.7 KB Created: 2021-09-08 03:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2cfbed1f10fb9945f8b3ed6442a363f SHA-1: 86fcd0a8189aefaa149d26b1d3f1d27ca410a102 SHA-256: 7d506aa8bce71b796af462bca3cef47ecf019f8a61c03e0d5f8a4089e22accf0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=slope+worksheet+given+two+points PDF link annotation
    • http://bindashnews.com/userfiles/file/61339004782.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0e01f51e76a81f5c1c8f36e244f61222/bisusipapakelixek.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/63460312528.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/zorutebojugizobavokofi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af1c408ba---52312137982.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/41026973757.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/n4j6t5ph5qn97k38s8n00cji76/23084996447.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0be3689d---peworazotubefo.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/85797328365.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/57375686564.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/13162473479.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f617a363e0193bf3123011ca47e3aeb/xagadotafinutifamotubole.pdfIn PDF document text
    • http://millecolori.it/images/file/bofogewimexividijamapipa.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a46104fe98736a5de52119690519e50c/xelafo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/bj0ko8e5c7eqpr04t4b0djukpt/rusewa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b98fd7c7e3e8ae77f8d9dd2fc2bf66c7/motakow.pdfIn PDF document text
    • https://coevent.ru/upload/files/siriketonuzef.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/85532013415.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/worolubewuzivibebilobun.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/96553579175.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/gewazumeravubefazefod.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd41b16e5---35175733506.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7626e4cf623872fcaebd538031b9359c/zozijenosibelezexojoroxad.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_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 19604 bytes
SHA-256: 3e27fa85f645331cfd44e78ebac6e185b9c35c93fc693e9416a53e3e179cb86e
font_02_sfnt_off000148de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DE 10688 bytes
SHA-256: e611c09b87a62de5305109a1fb7694d2597e538eaaa9e62376b9e53a450ab543

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