Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ace9503f9f09c2…

MALICIOUS

PDF

93.1 KB Created: 2021-07-14 05:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0044724d3f920d07ee31f74b8e7a1641 SHA-1: f6ba8c021375a5258565088ba4a3f0491d69a147 SHA-256: 91ace9503f9f09c2f308ca1d1fc4865f7915f38aa3049e1600ebf0e6fef13fad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'Fake invoice / payment lure' heuristic further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=negotiable+instrument+act PDF link annotation
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1fd469f97aeae215b75e6f909f409313/6653863307.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f7beeef3---nasoroluxijilutojow.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4outm16mn6lv8sv1kthe6dvqh2/60256966287.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/78632484775.pdfIn PDF document text
    • http://groupkaishan.com/d/files/62144686723.pdfIn PDF document text
    • http://anupbolivia.com/images/files/birufufonezuvod.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ced0550c---24464425839.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b4d017efc9b2d4f417b93e4088ca465e/nukibedijifimulumofov.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/17676311325.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f334514d8b---82474771273.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a77e72263---nelisunemarupeligup.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/rexaxo.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/61612313444.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/jukejatazokor.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/21299744835.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0e3b512fd9db0f1744f9da43e3776c74/62161321802.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/29936210103.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/39344352169.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edfac408782---41357762386.pdfIn PDF document text
    • https://zold-kommando.hu/files/40129709611.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96784632c8---kukezawotipuruzivunazezi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/aaf2618fe6ff5bba89568da046849611/7222308142.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c71e0401c483302c219c74cd9eed19ce/19771295716.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/59137583264.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/17364468107.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/nokoxaz.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_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10788 bytes
SHA-256: 5c77fbf83b51f1ce59a9e6f353f1f741a14f76d8526685a0d31de9ffb89c368e
font_01_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 15808 bytes
SHA-256: 827e8b95089983d99eedb78fa345087763ab16e182ededc28419fc30a947fc1a

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