Malicious PDF — malware analysis report

Static analysis result for SHA-256 d234c81b15bf76c5…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 05:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28deaa95b655f7f294434e0b19263f7d SHA-1: 5224e2413d1477aee2700359def4d9704008807f SHA-256: d234c81b15bf76c5ea8cf87b38bbb2ba7c56181e95c3c0781d35cf57079b9ae8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://27061010.com/uploads/files/202109242345351589.pdf In PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/54312984215.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/damobulamusopagujatunugos.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/dedanalobetefeler.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/80585370587.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/agta3et67nhgo7tpthd8num3j0/kitonunafakivujujo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148708908d2c---gorafinux.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/89538500883.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/59589431795.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/81638802555.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b348cf332d---gisisabituse.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/mirag.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/sumileromiwi.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/24545264246.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/31201692066.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/35111376623.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/32024807514.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/42546729307.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/58932253367.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/vopuwuzixifuzezifiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=graphic+novel+pdf+downloadPDF 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_off0000aba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABA6 16480 bytes
SHA-256: db1e307778255684903bc9ffcc13dffeff0d17ca3aad274de0ddce7b187f6ce5
font_01_sfnt_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 10640 bytes
SHA-256: 809470cca4f8b37ea8f1bbb2188378b082791d8a58726145a547584383e5db3a
font_02_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1