Malicious PDF — malware analysis report

Static analysis result for SHA-256 b098917d8f94783d…

MALICIOUS

PDF

91.2 KB Created: 2021-09-15 21:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9a6c46fbc14d2fe462908905bfc8e7e SHA-1: a29d1df8d263a11fbb6f2f205b94ca8455550304 SHA-256: b098917d8f94783d1247079709a877edb5b7b9cc86dc2014564440999049ca1d
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites, indicating a phishing or malware distribution scheme. The PDF is structured as a link farm, with many links hosted on disposable or compromised domains, suggesting an attempt to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crysiq.ru/uplcv?utm_term=chinese+mobile+price+in+bangladesh PDF link annotation
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/13676060427.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/8515236911.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/40601903971.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/10523884743.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf89c45a4---36164876999.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bidetoxexal.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/76684134499.pdfIn PDF document text
    • http://allier-genealogie.org/File:/31297538921.pdfIn PDF document text
    • https://medpressa.ru/files/file/76547711066.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/takero.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/11718203779.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/52926497838.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/84607194344.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kijodizobop.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e3ae3c55---29894717420.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/36939016805.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/46253257302.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/zegakaxaxagipu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2b64085f---kalawikikaxigomoraso.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/96388871554.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/92639558645.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/23272804497.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_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 17020 bytes
SHA-256: 6b21769540c5eee138476eeb9b1f4d00951b027e8905c284a9afe9989af9e4d8
font_02_sfnt_off00014622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14622 11036 bytes
SHA-256: 92377e0e64c6a33ce124606c7439c16814559c29ace6990d6d75e016963c86f4