Malicious PDF — malware analysis report

Static analysis result for SHA-256 452bfd6134e9058a…

MALICIOUS

PDF

91.9 KB Created: 2021-09-17 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7aabdd730833892280ec639e77d731e SHA-1: ee3e9ec7f708882732bac7ec6f9d7d93392b51d2 SHA-256: 452bfd6134e9058a07d4603aea27498d90dac5d05876de3b7356be9a83c83277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.chp.pl/ckfinder/userfiles/files/tewegirokaj.pdf In PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/wetawanakazi.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/69568737170.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de318f908---7842753700.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/73583506363.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/39270122934.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/71781424760.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/rajivunizilotexevot.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/rupis.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/gixupokuwitozodebe.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/67648471950.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/befafujorivitugawakixeluk.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131712d15db0---70883877137.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zamatavamawobuduwug.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/sapomafamazetiniz.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/gelajudibazubaramemid.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/2327786699.pdfIn PDF document text
    • https://kratky.eu/files/file/84033622493.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/28646853327.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23130038495.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/418e9a8cc0fab53789788870e25f6705/36798420581.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/11134472385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+last+airbender+movie+freePDF 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_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10788 bytes
SHA-256: b085bc6394e782b6934995ab8dbfa21c02584c3abb721e95d5f78abc13b32a2d
font_01_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 17228 bytes
SHA-256: c5d5d25628c7db06588f2d2e78a13fd9dd28133ede37937f9b8e59a66ed7544c