Malicious PDF — malware analysis report

Static analysis result for SHA-256 181f3c5e2900c33d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 23:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e7e1bd7ac81f44dff4acbbdfabc8de1 SHA-1: bc0afbb6f6cd7d4da02c0025e580e39dc548bd0c SHA-256: 181f3c5e2900c33d233926da859cf306626588ce51e56e3dff44d3be0ebd4ec9
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://binarbaidrealestate.com/public_html/userfiles/file/17124329042.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6fb54eb73f0edb20f5328dbb1d5b998c/pisosasuxexinigivi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/79217318862.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/bunib.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/862b410b6ec19212eda7f9ad15be19ce/sorumujusabazuk.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tomiz.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/94196797019.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f50351809---funukofosesutiwiripek.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/842dd76b2c3c60ba42c24af13e3ccde8/21854607173.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/gujazilekadinenusisaxoko.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea53af50---tipawotozazuneruneju.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/42658434237.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/60147880563.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kotinapupagufapetilu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/84614916327.pdfIn PDF document text
    • https://agermag.ro/mm/file/zajonom.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/71660173266.pdfIn PDF document text
    • https://maviet.vn/upload/files/faxuwakataxosoripoxisitus.pdfIn PDF document text
    • https://actorconseil.com/files/file/xiwaximewikozulukujimu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c10e14fd2138a263f02311b36f19fe9f/xavuwumafo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a518f0568---damesa.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c3202cc63a759cfd14302022802340a5/kigasulowasomeg.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/50627303995.pdfIn PDF document text
    • https://tavio.ru/files/file/rowewir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cooperative+federalism+pdfPDF 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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 15832 bytes
SHA-256: 2dec6b141cfcecad2137f28dc6e3577e72d9311da7fcf52df9f3d799df012515
font_02_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 10652 bytes
SHA-256: d0cbcbec50a29cd7b67973da5ad466547eb4ef8f59a0b65c3e873f8670ca97eb