Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da5adb21d65684d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 04:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 325f9427d348b1c58ba6145eca3dbb65 SHA-1: b952bda43bf41283f20f6d47e4bc326c068f8421 SHA-256: 4da5adb21d65684de9cf96e93c43eb270825b03b6597913b7185e5e1ba76c7d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=atlantis+the+lost+empire+putlocker PDF link annotation
    • http://getdol.com/page_data/file/jopiwute.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/lawilodotojosevul.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/88762941678.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/kokadufumanovipizepo.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/zekufojazebipagam.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/22510555665.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/67194198370.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/7574443374.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29cee8c606ac4e1d96e3991dbfb783c8/758041068.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/bodamuletularu.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/komugixugetaxepudawa.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/37728731394.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/89011652110.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/67331423162.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/43331218959.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/fefuteroxojipukunikola.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49736313024.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3008f01a---31589044190.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/95572299958.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/21027180449.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245f224529---mojawivo.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/83238967018.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/5155659168.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/woxebazuwulitozinabeji.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/wigaxonurokugawonorojiri.pdfIn PDF document text
    • http://screen.by/images/file/vepibokedoxipuzerogilu.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 10812 bytes
SHA-256: 00756e3fcd3e3c67ebb06bffb9bf1c253ecfdb2ecb1e1311be36a288cf56d677
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 18568 bytes
SHA-256: 189b5e7b6a736ce96efefe5c19e79083145caaa366321d86c88f82b0e38415f2
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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