Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3e6d43ec871e3b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 09:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 087593bb30fd483cacb697a10e13d433 SHA-1: 9e4fd5e9c2b005ce60fabe7912fa05fb4688122a SHA-256: ca3e6d43ec871e3bf23ef72c094d8994bcb502dbcb8fe332f951016e4e5a459a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=contact+list+being+updated+redmi PDF link annotation
    • http://greenworx.eu/images/uploads/files/48749432631.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/telirotafeli.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/91491954024.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/41393116611.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8b0s98oph703du793aek88q6j5/7889434349.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210922_215052.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/76176988579.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401acfac07b---juvanojebixozinisuj.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/gijobixuk.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/70348946049.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14510689970.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/sijuwopobuxevemij.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/jafodogexaxebiwibekokafo.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/48960580073.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161475e560c7d6---31099343434.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/roxerulagizorodapuri.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3213aec31---58215008160.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/goxonidetil.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0c4b9029---70688179357.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/49389918532.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/wajakapokuniludigon.pdfIn PDF document text
    • https://alohasafaris.com/files/sefodavebiwafokugetojira.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/zenupig.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95db4c094---xoziwilesakuwivado.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/87168695495.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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 11128 bytes
SHA-256: 7d5b9e44e94f8a079878b505270b27d44e1af6e0cc77a91936b062537e2bc677
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 17420 bytes
SHA-256: 7a6986958553d650abf4b03575ef34e7d2d83ff35bfdcf3fc2572306c3a9a3c3
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1