Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b256d20b9e6a89…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 16:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c38f1b1c5f700085b27df70dce509513 SHA-1: cc808e1910856cf529feb722959f0fca03a4115c SHA-256: f9b256d20b9e6a8999fead7327b2b4f3ea7453c75690c741d212c927ef1d12d6
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous external links, some hosted on compromised CMS platforms, points towards a phishing or malware distribution scheme. The document's structure and embedded links are consistent with a phishing attack aiming to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e211478bad---fifevejewop.pdf In PDF document text
    • http://damnoen.com/ckfinder/pho/files/dezekebogojumog.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7mhf4le7moogug3dg66iqnguv0/jajidimajeje.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zezaxawasebat.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecf655de6---89112409157.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/99791972023.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfff1ea449---78687701404.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/morajowupipesafu.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/ladazagak.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lotenupelonalupika.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109092200463560.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/m4nt8as9qtesvehes9qq9ikeh3/85703863363.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/8352237362.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa10e314f---tokudiko.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/59238019505.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee483825c2---95718534338.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/visisidepukefuvoranuzemob.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/mojogo.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/93229178793.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/88958277.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/vutiwijavof.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/59148495603.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/26085905151.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/gatufarasobixogogew.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/terabanogirefokeli.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/82753155566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=connect+my+phone+with+laptopPDF 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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 17532 bytes
SHA-256: 57eb739f2b2d67ff50a708267dd7b5672924a75928130d8484ce9b5f41e1e1af
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 10604 bytes
SHA-256: f7f67713acd5a17529567943ec4ccfff106f4c753f67ac85db9627750fc93f26

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