Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc9f9bed095b0c6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 09:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa1a32ee5fa1b2ee4515e4816593201d SHA-1: 1658dc1521f0f34af331a9888d4660ca0c0641fe SHA-256: 6fc9f9bed095b0c6585da89953ff6caa0cb2d013c6afde8ae21bd7de3054cee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://chokysitohang.com/Uploads/userfiles/files/maloremofawo.pdf In PDF document text
    • http://rogo-rotterdam.nl/files/dewewapupaxi.pdfIn PDF document text
    • http://kgmda.com/upload/files/49513795314.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/naligowub.pdfIn PDF document text
    • http://nenorm.com/files/files/88398997360.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087473461e02---rilefumaliweninavugo.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jepaxatizikixevulisi.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/kajigifawawewo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830322b06e.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/pupojizoxuw.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/tamijowi.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1c7b4aeb55e6e7fa5b3e1693b202e154/zanopovak.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/nemojin.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4a3093ca28e29aaa2a5502e164f0a58b/93827506965.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/99d3f06cbaa49ff69fff0eb9509c6da6/3256458297.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/67784051858.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0e90cb26---72876683258.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/dukorugonaxalexizoleduse.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210628/1946488346.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/tefinolabazemovedem.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/gewutizativado.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b3629326f5974b1d19da098612b59e41/katafuvavadefit.pdfIn PDF document text
    • https://wineart.online/userfiles/file/31954614204.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/70a556865f367b1009a8ae18ce9d3549/limajelevelubasufuf.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/55227881028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=importancia+de+la+literatura+infantil+pdfPDF 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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 18976 bytes
SHA-256: 05aced24328e66ad305d2fff435c8a983dabff587641a0e3cd75d41cc3fca843
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10664 bytes
SHA-256: 1fd86de09e0d6083501f6c53a6e030a94e30ee5f7b91ad905a014961649e4433
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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