Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1e3e0ef4745654…

MALICIOUS

PDF

109.3 KB Created: 2021-06-21 10:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4e0b19618e44fa0588c3f40ff7df252a SHA-1: d16ec9e6e0791c8201a2a1db10ed5d4cfa8f2659 SHA-256: 2a1e3e0ef474565483c51f1869ed0f3ea426f0692c901f6095fb7ef4d00e7853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, many of which host other PDF files. The document body suggests a lure for downloading music, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee53b94d44---82073549286.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8caa3719---daxegasuniviz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6eaae5be8---tofebokud.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/708a166df3b83017848ebb21526dd2ce/semeravutuzames.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/807713adb72e07189e8dea02ebfec636/66186762224.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b88ba853764bae6453eb0c94f68d9cc0/68348800398.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/damofupeneleseto.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ed722be5---15476134922.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/baa65884ef5a8cd373b4dff34c46217d/pukowiduzimufegegelebul.pdfIn PDF document text
    • https://agatanorek.com/files/file/65633515866.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/54762519651.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9887ddbf---fezaba.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/20216171081.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/2054651511.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=teri+yaadein+mulakatein+atif+aslam+mp3+song+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14633 7884 bytes
SHA-256: 666601a4009c469a667168ffd452b80be28147564a9b81ab94c71acc3a241ac1
font_01_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 5732 bytes
SHA-256: 1e67c50008cd3c61f4d0a0d322937c5b0fa7ad8e1b42145cee3a4eca240f518d
font_02_sfnt_off0001747a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747A 16248 bytes
SHA-256: ea7d7395d9c4447fe9eb1313bc2dfc8a06855e887d574a02d6c5aa072d2fa87d