Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb59a8324374047d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 01:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2f27ead25c6a1c9ebd1c72b8ea94e66 SHA-1: d4865b42b13fb856091065982a0eef568193e2e8 SHA-256: eb59a8324374047d3d5765fcb2c7300e01e419bfc47a2c302a95778eedcbeb6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/11697ff48b786c1e577334211fde9f0e/malodipufobedowinanubus.pdf In PDF document text
    • http://annabarons.lv/files/files/8343568841.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/10414247813.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/25040464808.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3828de2ef---fonawudes.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tagufanidusigejoz.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/mopariva.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sevegaligusizixozefubas.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15698594753.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/nawowexugukilagaxataw.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/rijutupizubogij.pdfIn PDF document text
    • http://bamor.org/userfiles/file/wufemogepilupemonavegapen.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/69344128184.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/ginavibufijakasixesap.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/xozube.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/silabubufuvinim.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/69323356184.pdfIn PDF document text
    • http://4darchitecture.org/img/all/37327749308.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/worutez.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/11806251507.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/38653933869.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe86258a1---51016260903.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/jaxepanogezenimatotow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sega+cd+emulator+android+apkPDF 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_off0000af05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 10956 bytes
SHA-256: 4a9b7a47580d7e721d4cd95e07eaf361bdd0bd7bf6fe5a7a17cff7ab7b9c9435
font_01_sfnt_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 16280 bytes
SHA-256: 89787043fc930177ebec19372176d8b62e28884b2b6020aa2da17b822e213260
font_02_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1