Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce8fba450a888d9…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 06:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba837240db80be4afbecdb3ab2a526f2 SHA-1: 4f3e616a0405aa3fa5a2a3575e26e8773b6543ad SHA-256: 3ce8fba450a888d95be427dd522cb71e88e93c4ffed612ee186b426aac0db6f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://khacvietlaser.vn/public/images_news/files/sulozomib.pdf In PDF document text
    • https://dukupahit.com/contents/files/wipozogobunuwigu.pdfIn PDF document text
    • http://e-menu.hu/editor_up/16681889458.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/13229642940.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0b634331d174c3d6bb22c399c196a98d/folimemasakitas.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/nawomuri.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/8461842470.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/50796347275.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efe4080eda---viwagefasevamar.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/xopokedakitipexer.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/34652583045.pdfIn PDF document text
    • http://refmexgl.com/web/uploads/assets/userfiles/file/degaminepolexit.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/42803601601.pdfIn PDF document text
    • https://unaizahic.com/Files/files/tananigusuvawodifok.pdfIn PDF document text
    • http://handgun.ee/media/file/76828710321.pdfIn PDF document text
    • https://rintrans.com/files/vitetumamuzino.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jarowidaf.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/kowutilur.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/dikomaluzijojisibi.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/wiriwameme.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9474b3405---furosesozud.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/puvovibokebuxejabeburi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dj+song+pandaPDF 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_off0000b0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 10228 bytes
SHA-256: ab6165238558709a4932520b9e60721bb74441661429f2523823419aa94213d6
font_02_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 15576 bytes
SHA-256: 88597ff04622cfaa3857ddfb5366b70a50770c6e7f12bbd7c48ee534cb20b1bc