Malicious PDF — malware analysis report

Static analysis result for SHA-256 b685e3735fa630ad…

MALICIOUS

PDF

89.9 KB Created: 2021-05-26 07:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 317eae4e596f9aa3c2b61e41ff17f0ec SHA-1: 736d9129c6a2cb6ae6d108b3f483cc6c31f205dd SHA-256: b685e3735fa630ad023e8133a3d0f73b2f08cb8fc1cf4e3581c92c100e84810b
156 Risk Score

Malware Insights

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

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 0.9995

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 https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/dsndh7moq668fdgd6knea0ooqv/96027121209.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2536e0037---fugeferazoloziporabuwavik.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c373fdb76b97ab385a443e0753a2f55e/siteb.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15bc9f421---fipuno.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1l6pgi5op54408ckjtjpfgqo6c/mazisiwawove.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2fdbfa9b---votovebefukonuzotetug.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d8c1d3a1e987d4974ba0dae260735741/kovap.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1204c0a9c3---dasasewomuvokadixuporus.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/853209224a373f9e224038d4d5b4c142/gupisinolazozaxasozokole.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160760377e2795---mivivemosugu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ne0l1jqp2rpqa0bi2cgf3kq1cg/3775460226.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/tigitiroxenedunolakajaput.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/sisozexoronitifibemeputi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a64dc0351d952be3f9857c0553fe0769/45739449128.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77b277554---78510825492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=present+perfect+progressive+versus+present+perfect+simple+%25D8%25B4%25D8%25B1%25D8%25ADPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011c86.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C86 24020 bytes
SHA-256: 7a17420eb703f99d46d583ba90420288c950b55569378f2109865166d8b7956a
font_00_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 5068 bytes
SHA-256: 428e50112f29220a162c50c0c986ef105d4cba40eae892dfd3765aa16968f3d3
font_01_sfnt_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 10112 bytes
SHA-256: 6e3d4c222769e3ac536094da5137087c37d4373da056e2a9f27c524bd9f8ca7e
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 16476 bytes
SHA-256: 1ea7b411bc0916e2159399e98c94a48567805befd6a7b24d19f219afb9656a83
font_04_sfnt_off000147a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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