Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b105f00fa6640f4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 03:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d4bff88022fa71da64ca53ff62f5cbc SHA-1: ed28c622b49d3c9754f68ccbb4e89a72d5013070 SHA-256: 0b105f00fa6640f41c5591609e6197bd42492e1b7f186e7bf98f422b087ba528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, disguised as a resource for downloading leadership skills PDFs. The presence of these links suggests an attempt to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=leadership+skills+pdf+free+download PDF link annotation
    • http://goldenpeak.it/userfiles/files/36202846149.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b228a08eef5---17046399901.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d90b06e0ebf---60370418851.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/51499479482.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/kulefagizunivasab.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608150e873077---rupekopukisoruvurenegi.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/113156397.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/lajepexuvanavupunipa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608862335233d---ponofebilafamizi.pdfIn PDF document text
    • https://tpk-m.ru/files/file/darasawotafa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112a4f925a26---89192815439.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/kuxexibelupib.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/kagisenubogavonepajasiva.pdfIn PDF document text
    • http://arablift.net/userfiles/file/84658464944.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8be88d254---gidova.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/96180275488.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/nbpghqq4l3r9r3m1bkfgvhnsa0/tujujelejek.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/43607426143.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097358d95429---95881569063.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xozavuvoxoburaja.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/68733286057.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xinomunuvuwinipawuniku.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/8456709694.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6134090E77240.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/jajexasasidodup.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_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 16644 bytes
SHA-256: 39125f8c5c540f54cf1488a99d89bd791efb9e8ea0f3bfc4046c5f629d1974ee
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 10632 bytes
SHA-256: 5a45ee8f28311788e30d8a4bf98e6b2e3a889fe6ac7102bf383ffe3e5afdda61

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