Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3829610ee4f5c62…

MALICIOUS

PDF

105.9 KB Created: 2021-07-21 00:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 201e2c4ca0ffad2b33b0228d4114d8b6 SHA-1: fad3b24d9ea25f4a12d32735206b57f424dab451 SHA-256: f3829610ee4f5c622fdb41d915f61264866515a4a43f96bd81b7268f77af2c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

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 http://dellalontra.it/userfiles/files/vosirizitiri.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775393d564c---nuxudujefavovajaro.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfcdd16df---32121129664.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d3be3db6---kabilerodesof.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/94472033524.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rnlig1qc9um8phem4q9s6o3sn0/pivapakufudinonufap.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804519e0eef---woxoxasotolonovasoba.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/43030196046.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/41086107661.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b37ff2c8fa8e7c8349c1a09c5a953503/42821622024.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/35366587373.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5846c71d35de467549114d776e0ffcbe/toduwowafilozirajili.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c9a445867667ed799f7c950c1e5c2ddd/riwanajuw.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26f5d073a---6955953296.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/28064172281.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/23566250620.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92483e95f---64483333909.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee15deab74a---tinovejitevekum.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ca5cb5effb3aac9c3094645fda72da91/kamanidonum.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/lomuwuzagejoselusolemu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c94183b1cc9---33874139165.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/27210545795.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/77078630187.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/46053040972.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/as819t13jrf4nfh09ji4oqdpba/88326646952.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/74873790051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=relation+between+buoyant+force+and+densityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 10952 bytes
SHA-256: db98a30b05378ea7ca45f94ae7ae6382d381b8938585ef7993d4cbb64eeefd87
font_02_sfnt_off00014d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4E 19284 bytes
SHA-256: c3424eb869cfc6c6b335051b9720f0d3f0d515e25b15d373498705e2f8cff8d7
font_03_sfnt_off0001803f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1803F 17064 bytes
SHA-256: d622904cf062b5a91e7f590e4a857f128f41e426ef60400150c936a16ac82974

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