Malicious PDF — malware analysis report

Static analysis result for SHA-256 401dd0bf727046ce…

MALICIOUS

PDF

116.0 KB Created: 2021-06-16 14:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 522da9ba58e2be53c248abe09ec60b77 SHA-1: 8e2d559caba7cbb4c62e4d5544fef4af185d8324 SHA-256: 401dd0bf727046ce8d4a4be53e4b83de6134c598534b08279db7255ea9a319d9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=download+age+of+empires+3+for+pc+free PDF link annotation
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609109b44e55a---xemegenugesukawukas.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ed4ea917284518a806f8d7e0ed667269/24986906732.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/kotimekipoxor.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/987d753a2635f3b7c08949b56f0961cb/74522030173.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1eb0b960b5ad27dfb2b2b66fe26ab178/semuso.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/wubawoxelodipenapakimod.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e327e8c65963eb973a21c8437ae9203e/vowepape.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/92861092530.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ad581ece---lefow.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce4d5ffe6---vilujagenilijixewex.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f4f5a9e58242bc2ed50727c4d8b75de3/neziwelisakajusedozax.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/levomutekudojogolu.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210530002603.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6bfaa62c73070fb933aa9d1b898d94a3/23974584810.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a743186bdd4---bapenakukotade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000167c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C1 5732 bytes
SHA-256: 39e3cb82534586f1be55d2083bdd9da9b41e7bcaf3d07becf13a3640fc30ed66
font_01_sfnt_off00017b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B49 1984 bytes
SHA-256: 6b77f015d75589339f99951b3e845d61125308916dc85756c3c068af0eb4b1af
font_02_sfnt_off000184b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184B9 11624 bytes
SHA-256: 34fc91b25beb5d9de8df0fd762cb4c90843b09729b65e4b44b02fbaa14b30a83
font_03_sfnt_off0001ac90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC90 16212 bytes
SHA-256: efa10eb016e3f3b0b4b9ca88735192a2169c3e2ea1838fdfae102cdad0ae9fb6

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