Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae85d62579f469e…

MALICIOUS

PDF

71.3 KB Created: 2021-05-24 13:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f7989449a90917facf20b316889c32bf SHA-1: bd86af674f4f97a45f60e75da7c982c0f9c31e99 SHA-256: eae85d62579f469e5b2afb796a67b52367275891ec3855131bccefcd5229efcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document uses a seemingly innocuous topic to disguise a link farm. Numerous heuristics indicate the presence of links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc2547ada---98408936876.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81722cdc1---womuxufujozalir.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1cbd8tv7ctitfmf694ih60fsub/35133437652.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/613806890.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/35559165537.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b8cfc6ae8e1ee6621b4efe924abdfe70/99579929798.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/skbcre5sc81mpjfkfhtj9hrgsl/gaseriwosilagopes.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2389f2743---1255250347.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/su7hrh0tpo0o7u8e3o62dt635u/23524030645.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082610ab71a3---jubudajasusobe.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a193703e341---paragubefaruli.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d60abbc8b86ab0b90204aa1cd771d6c4/katimujawirar.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a53f8ed6f---51957204036.pdfIn PDF document text
    • http://amd-export.com/site/upload/file/3129327700.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160968e9be55fd---sikiligonafogibonoledeme.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6ed28c540f8a3f0273d7ef0563b4fc05/fetegirunaw.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7c8ec248e2e5280cce2d486b56f64f1d/zetovadexatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+adjust+kohler+thermostatic+mixing+valvePDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 5676 bytes
SHA-256: 928b0e290579452d5e0555b54784cac15af275764c8504ccee1037f73f3d7334
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 11588 bytes
SHA-256: 45a67418a87c72cd85644272ce4d3afa266c2a217ae8bb3f4083e5ae95a20282