Malicious PDF — malware analysis report

Static analysis result for SHA-256 7041a7e0c03b0c62…

MALICIOUS

PDF

89.2 KB Created: 2021-08-01 07:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a70a845f2b6095cac9ff4bc2e4eb92c SHA-1: 4df7f3cd84e0b100441b1ddde8348afeecd8bac8 SHA-256: 7041a7e0c03b0c62232059a7d822cba8939db556754bb2055bb99eee2d84a194
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent. While no scripts were extracted, the structure and heuristics strongly suggest this PDF is used to distribute or facilitate access to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://artecgroupservices.com/imagenes/file/xogetabilewifofufejerogof.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8934b1bdb0---98541111815.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/57774866133.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53976269b---liwekuwavezinowef.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/51852546672.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/75059334626.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d7e74acf6---pegadofuximumeminojum.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/13683308400.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fdca7c4e1bc6abf117c6de98b6218b8f/73217929828.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16085767d46e6d---dagumelorewura.pdfIn PDF document text
    • http://rykatd.com/files/14567756500.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/39112693870.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/25965729699.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/76205373998.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bomodumi.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f236f50db7---72260843382.pdfIn PDF document text
    • http://huiking.cn/uploads/file/081957255265.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1setnm8qh1enu4n2utjbcj9b1n/11247833072.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/garirip.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079a126a8297---jovezemojaf.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6e6ab7e3b4fd71d37bd634520233edd7/ronafiz.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/tusiniweleboxipufasuv.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/40525957a0878351191a82925c8980a2/wupuwalabega.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/65268601922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+much+does+a+chief+compliance+officer+makePDF 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://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_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16860 bytes
SHA-256: 3c79b190cf9b62dca91ac60a99c86e24b2fa4d0270ba2d7381208d5f13bb29d7
font_01_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D35 11056 bytes
SHA-256: c70391503fcd420341289c5d38602dec8070c83ad56cbda3d00e0ca9077787e6

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