Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9090e23cce9ff1d…

MALICIOUS

PDF

94.3 KB Created: 2021-08-11 03:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0df56b94eba2030daec1d8dc03c4fc50 SHA-1: 030ee3c6a68a3154294710e9621763d34c049f0f SHA-256: b9090e23cce9ff1ded5282fb3dfe6cb18532f025bdea0035f75e4594ba3cde25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://linardi.ru/files/file/28949426939.pdf In PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/79934416707.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/mipeteporokadarugajekabo.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/91752564068.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc2fca8b9---44695714485.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/65688934569.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8a3f20c9b28a7a86ef77cd4a3d45e07e/bafuretekeme.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/54513531662.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adf2d08bce4---85931570859.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/1qhrqkotqrk3vb9md8uoaeks25/78664843333.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5cebbe30a---88698465785.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/12f8c30c7883d6b393ad7efc8e894819/13318793721.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d86c146958a---5426157361.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5397e3f1ed---52925429237.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/786e5f4b7a4f5a44e3e4802b5b514a8f/xezugogevigonij.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/matosobeg.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/52961010892.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/10rg6piajtc73lmc1fn20slg2k/82702546958.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ff0820a88622317de672cb9daddf7a7d/39466542093.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b9259a1a1ca---68509125349.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/ranebapijes.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/zulizedut.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/bafinij.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/54885877085.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/76482392215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+app+do+i+need+for+apple+watch+ecgPDF 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_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 17004 bytes
SHA-256: 16277222a660a12b876d315c9f1cf97c1f5e231084533a558153b8ed63e459e2
font_02_sfnt_off0001516f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516F 10812 bytes
SHA-256: 2affa8f073914fae944df43a17f8290548c23c5cf6a077af21fd378aee1086e3