Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba37721e9be65ee…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 19:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d301f61aa74730074bbd8d5850448e9 SHA-1: 20fe371a7470ba134b1c5b02c55e28f9ea02cd8f SHA-256: cba37721e9be65ee89511bad1082bb64aa3e8e562a3130207c3e594b865fd8e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614167d18a9a7---24181007885.pdf In PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/zujigonepetufenela.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/girakukarodoz.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/walebosazapigotenobud.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/56477596905.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/19775172713.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5ku75j3e8h5pt6dmvv5r3no5p2/gatazobedadavagiketika.pdfIn PDF document text
    • http://prestopc.it/upload/file/tinabivedavabivado.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/97792376378.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35379313326.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/27f0948224eed1185428ed985560471a/polij.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/23564252921.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/besiwuzufegujikizanimeve.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/98236570795.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/puzibowaj.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/zarodofizizevamudanota.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/3351210119.pdfIn PDF document text
    • http://ativn.com/upload/file/vijupozuperinusajakafij.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kilegowisiwuxolakumat.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/tukatuwifarugabojosopazel.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/399fc1f85bba2541a760a17fc4869e8c/wovozodufokuw.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109041801552737.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/pavofigejedanagukibizuxi.pdfIn PDF document text
    • http://artospace.com/pics/file/3333457540.pdfIn PDF document text
    • https://petribax.com/userfiles/file/wavezunox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=view+downloads+chrome+shortcutPDF 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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 17256 bytes
SHA-256: 71338b85675958816a29e7df74c99c06698550489e40aa3fe3f77d8e7a9e42cf
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 10792 bytes
SHA-256: 15d3439fe8c1be3755e490dbc31e87b63760fa9413df492035bfec2750b0a295

Open this report in the interactive analyzer, or submit your own file for analysis.