Malicious PDF — malware analysis report

Static analysis result for SHA-256 b589a20302569ab1…

MALICIOUS

PDF

94.0 KB Created: 2021-08-14 05:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 703cd07c1c51ce2d92b44df236584248 SHA-1: a4028b576b10cf9b8cf46606d74775e3b6bc0c8b SHA-256: b589a20302569ab1e8d84b071b92dfbf8d9c5c28da4ac4a3346117c58b8db6e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://cementfeet.com/userfiles/file/kowenanaforimovodixit.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40cc76ee6c---woxibizadixejizeko.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d3237f69451d77e345b5191b35e0facd/takuputu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3bc162cej7d8bmiiiv0hcks2fd/kavepe.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16103145aae4cf---88320152208.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/55795036240.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uigbtnpa0u4ek1q4un1r5thjkd/37309775534.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/ziseweruxo.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/14072640725.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/6301046895.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/kojolotugepusasipupakokok.pdfIn PDF document text
    • http://12shio5.com/contents//files/somejigam.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k8fafkuhu48tvqp9tc654eain0/vanemeziduzufewad.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/33513662648.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4abe8865fa---tamaboganaruziletexejo.pdfIn PDF document text
    • http://aqcons.vn/upload/files/zobizorifulivuzu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gizebur.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff45aa3e8---26920514155.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d191a898c430ead4f34de1476ae66c87/giteve.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/27979349192.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/78eb1d52a154949d0666c5b08223b314/12397855284.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/74544851695.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/26137693994.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/33726904485.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1c062f81---benozupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=merchant+of+venice+act+2+scene+4+summary+and+analysisPDF 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_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 11212 bytes
SHA-256: 5f1371000555e00896b0c08d661d07fb13f9f9bdbc65f43f17549038dd54b9a9
font_01_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 17988 bytes
SHA-256: df42001e0acf12422f033978dd0326a59a422906712e5f272dcf8f57819bfdf3
font_02_sfnt_off00014f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1