Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3aad56eea44e69…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 10:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b58f3bbff976671e8b0909c4ac6bfddd SHA-1: 253dbc94214b5e0e7f9a1fea98750adec19ebdab SHA-256: 4f3aad56eea44e69e76aa88ead5b9c4f58253ba9d2545a093ee8fc37a131fb75
164 Risk Score

Malware Insights

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

The sample is a PDF document that uses a fake invoice or payment lure to entice users to download it. It leverages a link farm hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/073938b5f2c48576c94aa8389c600d30/67037395723.pdf In PDF document text
    • https://adsbudget.net/userfiles/file/koxozov.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qe2ffivhkp70p1fl51vt4uc8ad/fufaxetatoguzuzo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5ebe13e96---97812007148.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/mizugo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pexegivokokagezizuruj.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/88091676280.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a823fb7e0e2b1bde6ab444356c54c8be/zonaxuxo.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/97609117431.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2739e8908---68989745008.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zogatum.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/65397712321.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4f00a3c0386465f3a898140a54a2d510/99673178766.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/23861213950.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ab9dde28---20765201150.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0il3ta35pf95h15f663k84fmlb/1599924164.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96e8b1fde1ba92acb55d690482214ce8/96131369968.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36aa8fa20---felesifov.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/82649113059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sample+letter+for+extension+of+time+for+payment+of+feesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb69ebf1c---zezamibiferezirep.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bisufoxi.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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 10808 bytes
SHA-256: c01a202c00c5d8289a24c23b9a84de6b41c7e105c0179c843989e132c96e571c
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 18140 bytes
SHA-256: dbdcf1d749ba365ed556cc3438a6917fb7344cf81edf43552f5a57571363dc30
font_02_sfnt_off0001313a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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