Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf352d41989aad56…

MALICIOUS

PDF

83.2 KB Created: 2021-05-28 03:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 19b598866a5f5ba3c4e79db539f70072 SHA-1: 1926b10e77e684e377dc3965c0b54db4fda29587 SHA-256: bf352d41989aad56a7d72da15230560feff2df7da634b9172e0f0461619ff0cc
96 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious destinations. The ML classifier strongly indicates malicious intent, and the presence of multiple links to potentially compromised upload directories reinforces this assessment. The document's primary function appears to be facilitating initial access through a phishing attachment, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=how+to+take+macro+photos+with+iphone+11+pro+max PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ccu868hp3drv0cv1llp1rfc74o/52911360588.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3486f67c6b---mafozudesonod.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/034a095e9b418519da44e3a69744de80/nefowabivodamizejeza.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bevapupobabineguji.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/aisnvser2d2rgofqmlgdvraqq3/36013561319.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5d3f1eb4---gosurufivibox.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0f24fa6819b65e5935dad76a8a4dab7b/12942411750.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mujavol.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9890eee9---bejovimepen.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/92563685654.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1ne6ag7esd437ii5kiuh567643/25371382198.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/338e41e421acdc5ac1b965b57a6cebdc/wegajokitabarav.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0r7q4hd6tj75trhems14qm3qtr/43647724698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 5376 bytes
SHA-256: 14786cfc058c963a4bcb0c62283b7059dbe56b6fcdd36a82550912ddc8838ed1
font_01_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 10688 bytes
SHA-256: 4be74e5caa5b5f2c02ed4d30cec05ad0f1a722b9f9bba0842e1ddd595392d658

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