Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ceb78dbd32e351…

MALICIOUS

PDF

74.7 KB Created: 2021-09-11 06:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32f92ac49f147454ca8e5af0a69c9f31 SHA-1: e4d0724956f0b3390a7fc039544b3535fe264b9e SHA-256: 08ceb78dbd32e3519f5b806d11863c3af4e917f0a4f6b8f0fa903e8bbc45a1c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of embedded JavaScript, flagged by heuristics, further supports malicious intent, likely for executing malicious code or redirecting the user. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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.
  • 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://barcelona-health.com/files/galeria/files/61684428481.pdf In PDF document text
    • https://ekransamara.ru/files/mililibaxus.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3ccc5b0a80a2d9f1def7c837728c525f/wugonulo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccd045977---7515602237.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///61325472395.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/puwebiru.pdfIn PDF document text
    • https://vitanov.rs/files/sowikibibapil.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/76647586268.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/96794855228.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/pidopusubanutomug.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/ledajak.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/kusuja.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7d0cc05ed4fc7af6d6550c6f3f534684/vaxet.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/51837388563.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/medolakolikiwivulu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nafaja.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379f175947e---93323369793.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/80330268307.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/nezawolugofosel.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d87d02ac8---dusekizufulopirobav.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/lisaganawiwijupewakozabep.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/kawivuguxebujopogezinufu.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/59596597018.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/rufozeligozobibojokel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=distinguish+between+prokaryote+and+eukaryotePDF 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_off0000c020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC020 11160 bytes
SHA-256: 77b668ae63ed47c90583e5f014cdda1445cd1ba4fbb728947bfc7abc278e578d
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 16784 bytes
SHA-256: 4d33963c1958b4363975d783698b65fe53e1e50de8d8f6ff252e8c510d0cecb4

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