Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56d97409dc57e2e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 04:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 204029277a31f9331380232a909b9917 SHA-1: 6869a9e88f94ee2552c3f697667fc1177c427cbe SHA-256: c56d97409dc57e2e1428fc06b251837e0230d2d799600188ac4fcea29f34436b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://veewood.com/file_media/file_image/file/wukibuwaf.pdf In PDF document text
    • http://xedaphcm.com/luutru/files/92862381184.pdfIn PDF document text
    • http://52963566.com/upload/file/202109090111316042.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dinepilojepozusuv.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/nikura.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_C6734D960EF32B3D.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/68419744629.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/dizaniroxerixagavobela.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/27882637650.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/7830312405.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/56346751879.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/50480674040.pdfIn PDF document text
    • https://cmoretv.com/userfiles/77239821887.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/11282069001.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/50813759794.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/45863079736.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/73931146091.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/kusigam.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465b281ecc8---21641887067.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c55003122b---11211826653.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f203fb6dfbcc5958fb95379b19147179/budeli.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/bawepunalaxaxuwujareg.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/tedofekenel.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/1826108128.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/pegoguzonanakenepasobukat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=blank+manuscript+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/37710648836.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_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 16244 bytes
SHA-256: 9faa8ee1b70af99d926c536b00337a55b2f8e924196ac927669a4ed9c133a61e
font_01_sfnt_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 10772 bytes
SHA-256: aabb53c70b7388a913b315e715a77f3655652cc0e1c1562dced7e3351de07584
font_02_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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