Malicious PDF — malware analysis report

Static analysis result for SHA-256 f998d19d9b40caad…

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 09:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-13
MD5: 98fe6a786cd45d73819314bc80b27223 SHA-1: d2edba620c70473d930e2094f4dd174464d37c1e SHA-256: f998d19d9b40caadebfc2cf6250580365e30482e375640bf22f4374f74053fec
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=ymusic+movie+download PDF link annotation
    • http://costruzionibulagna.it/userfiles/files/rejofiwaxen.pdfIn PDF document text
    • https://austarpharma.com/upload/files/91551455870.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/bepizenurovawodobukunuvi.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/zevoxubakekexifofupak.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/kabetiruf.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902071404359629.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc51d3db7---12228109029.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/kugipotuve.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/dapowadinonubupuz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vo15pedojhisjo4t1noeqlqcu0/xiwavedekavojabo.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/72816837667.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210910214922_547854897.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jefobokoxitojizarogivob.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jezuvelumiz.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/31174092069.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/jawazeve.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/foronuvawaxevunadifi.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/nawokigajopiwopuk.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/19856280367.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/kogelelirur.pdfIn PDF document text
    • http://duef.ru/public/file/37461617317.pdfIn PDF document text
    • http://htwy.com/upload/file/6034946968.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ca0b0899---78524881618.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/90965158612.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/nezadux.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/fofexoru.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 17692 bytes
SHA-256: 7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c
font_02_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 10568 bytes
SHA-256: d681f6d7e7c634d6acf1cf5af46b7a76e12141e3d85a46d39f88ee454a551d7d

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