Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc11273d2589cd75…

MALICIOUS

PDF

83.0 KB Created: 2021-09-28 03:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f11390cb279ef36dfd919ab1add2e3ec SHA-1: 069f2128cd4a9e291f3af7495c5cd85d6a33a8de SHA-256: dc11273d2589cd75bd02a4a79b522c5d9c46008f458a631922a8180ae9602d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent. While no scripts were explicitly extracted, the nature of the links suggests the PDF is intended to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=amitabh+bachchan+old+picture PDF link annotation
    • http://eis-pieschel.de/UserFiles/File/duletemexuxelajavis.pdfIn PDF document text
    • http://malifer.hu/upload/file/88428772542.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3658b0be29a50d59444a04ece3fdb2cd/72584907426.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/wipedimiwanovirevad.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/45779453319.pdfIn PDF document text
    • http://snft.ro/media/file/31567523617.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b6001cc0---dozemufe.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/vojizilekifi.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/toratoriturulaga.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/kezalusuxerunonenilajeze.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1d3778479---bogurawajogamu.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/78240499890.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109271145435302.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161435ed40f66b---16625746134.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/gubavafofutapenurarekuga.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/figeniretulovelimolixowa.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/29545501258.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vodesirijilubegik.pdfIn PDF document text
    • http://roocenter.ru/upload/file/29121071010.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/57761510441.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadda16983---57024001897.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/36397003944.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/93834085714.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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 21892 bytes
SHA-256: c3ece7b9cca320f142c2ee301fff33fac842ebf13d765b22ce6dd0456c9ea607
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 10832 bytes
SHA-256: 5556e73e2221f0573893621783c3044bf338de3261685abd0664f4f604513ea2
font_02_sfnt_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1