Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a4a666d9dd1bf4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 02:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5db8f793143b98ba80c9e79599c39749 SHA-1: f5ede7910d1a467cf6a012f8f12f4a1404f10973 SHA-256: 72a4a666d9dd1bf4e75de8668c0104e1648a14c63a0fbe8ec698951dfd14fbb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=social+conscience+meaning PDF link annotation
    • http://hlqh.net/userfiles/file/20210815180137_1739569814.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/bovesukuvitakamisuraveso.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/69976367635.pdfIn PDF document text
    • http://clingac.es/d/files/nozugukot.pdfIn PDF document text
    • https://kamedia.vn/data/file/wegawuroxizoxujimijuzi.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/gakag.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad964adec---22708468618.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/99538822986.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc0070dace---10609299756.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/k9du6g08bdkahnq4ugkas2q9o1/19766246886.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161155eff71104---zejig.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/12209408466.pdfIn PDF document text
    • https://grnca.org/img/files/files/86422959448.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/93a1ec7d3f5f708e1c4b542a23f111be/82719432508.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/46891865818.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/voxamusurukesopupofi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/23b6b800812de2c245d2a959545c662f/fisobijolowobuzamedetem.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xobake.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b31660b90cb---39436100753.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/22415038911.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10448 bytes
SHA-256: 06a5a738ebb0041b01ef9151ba630e5dd12c42395e062df84265b626cd2ea4ab
font_01_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 18524 bytes
SHA-256: 5669946ee86e37fc28e0a01e963e4d9532198da05f437926ecb096bbf9d41043
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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