Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1e70a8ceaa4259…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 16:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 644611632ddbad430a10cb5ed23e7ea1 SHA-1: b8baa1d78c82897d03479cb32e35011ae9c401ff SHA-256: ae1e70a8ceaa42593d5129855a98860fb08530a5030dbe28fbc7a3bf8f22b7d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate that the PDF links to compromised WordPress upload storage and other disposable hosting, suggesting it's used to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://metalzilembo.it/userfiles/files/fumijamojeka.pdf In PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/jegodewisozanovilekes.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/larofifulagajofaxa.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20211002203108.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613968586a5b5---96300973038.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/josawopozuw.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161526ce94b5f5---12925471041.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/rolarevumotiw.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xokonunufewadomifuvawov.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ab94de915fe3a5b4b5df2f2dd7d4e08/9192230144.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/46589545470.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/71508253051.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/37702100882.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/35449804040.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/57588054374.pdfIn PDF document text
    • https://mkontroll.hu/File/darasazapipovi.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/55652833884.pdfIn PDF document text
    • http://canadanur.com/resimler/files/tajoxapopi.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/xugobijakusunebo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410a13c05a8---nefituziluvidoxonifu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8df381ab4f51a8bc693f6e0edecd9b9f/23293073765.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/615b28ceeb59eb64aadf61a83de3fe3a/dafovas.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/81999537862.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/19210699366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=brownian+movement+in+tamilPDF 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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 10308 bytes
SHA-256: 09f33b49790f6f8feeb17bd4cd845c5333e5eca2f183c2d73ce6915c73575f1b
font_01_sfnt_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 14584 bytes
SHA-256: 6f9e13d10ca9df91aa035e51ec52bc1b4360201cf5ca61916041bd5e013a55d1
font_02_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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