Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dcdf3dc9a41840…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 03:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 510d0332a983cba10eeee27ec140037d SHA-1: c6b52728ba47d47cbe962cc35f4490a05838c609 SHA-256: c9dcdf3dc9a4184030a111666fad387a1e29f931fc6790de31320f83e101afe2
164 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains multiple links to compromised websites and disposable hosting, suggesting it is part of a phishing or malware distribution campaign. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://equimat-cheval.fr/file/94964226521.pdf In PDF document text
    • http://zajazd-broadway.pl/galeria/file/35852530006.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/21858361226.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/mataw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a419a62372---40119896667.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/dupipazopuxumamufidug.pdfIn PDF document text
    • https://duvanco.be/docs/files/sibatasekugitapazor.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5e34192c52a3c3c7b904b03c3cff961d/45625559843.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131423596447.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/morozexud.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/sikujolatezatagakofe.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/43389749023.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e8467cdc---sugiwovevekifilof.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/82594857769.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xamesizoneruwebe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ff25089c---munimexesamaxuxizizamuguw.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/23161223623.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/kekugezimujo.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/tenuzi.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/gasitezozanulapi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2b64085f---kalawikikaxigomoraso.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/xudixapudibebufomusul.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/dutilakamexubo.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vifipo.pdfIn PDF document text
    • https://n-tlg.com/files/file/21105302352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=xos+launcher+iphonePDF 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_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 17848 bytes
SHA-256: 1460e220ed464706932fffc34471e32917ab72d04b6195c5bc44efbd4090b8db
font_02_sfnt_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 10480 bytes
SHA-256: 1175b21adc2d82dac361740147e4ec5cec5d247f59d899d6c80472d7c0003d72