Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc3966461e390d1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 00:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f2141fa357dc211e185a0638ff90c56 SHA-1: 14eb902a02a65c0cf121382daa08a1f9461a2fbf SHA-256: 3cc3966461e390d1867c1a504efc80f8ab7edd8a97940502633219ca5c180b78
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=rokkr+movie+app PDF link annotation
    • https://siahotel.com/userfiles/files/32030375883.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/88117040968.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/numerisozuvozologomobosok.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/nomonisuninuj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614384048a53a---59262472330.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/97375997866.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614255bc583ea---73164946721.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/dufawuvenub.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99d896a1c---velijopadojalunut.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zitajilurokir.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/wujilowomikatorujigudex.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/sinesotida.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/vosuwafaderetafafimi.pdfIn PDF document text
    • https://wasael.com/userfiles/file/73405063208.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109201442455578.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f365e0dc---34206561711.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17241475861.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jifiriwuruveguwadus.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/vorolabinafavajubo.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/togipoz.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210903190003.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/25198466629.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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10200 bytes
SHA-256: fe1bea3b4cd778cd40d1d5ff8522d62f10c97b2b9d3aa17c7c144ae7281ccf05
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 17752 bytes
SHA-256: c1a5868b36c05c62993cf7adfda3ac1b2826df61e4a6693d1ecf335cc35a6795