Malicious PDF — malware analysis report

Static analysis result for SHA-256 e046ff675563de93…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 17:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c2f4f5699588b5a99cea0df8b7423ce SHA-1: 82b831d99c844e20efa5f15d475755caecc104fd SHA-256: e046ff675563de930c7ceedcc02c81e50270cb730489b8bf9a2e6d4747c1738f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious websites. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://catamma.ru/uplcv?utm_term=setup+wizard+phone+not+activated PDF link annotation
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/24832004865.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/wozunedezaxes.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab1c7194f---3837858636.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/rajuzog.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/82235346275.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/79712399311.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/66220703617.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-7/20210907083849670153.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce7a2bfbe---89680491385.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09998f907---kaduvokuzavo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161348cd3ecf20---kogelumasiken.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/33322723810.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613674bb0c241---nusaravosimixelo.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/33812649087.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/gekisubefut.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/tefozikukim.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/kuxesimum.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/muwuterixonurumawimo.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/wifavixamunuzali.pdfIn PDF document text
    • http://bociany.sk/media/file/ramititaj.pdfIn 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://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_off0000d347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 17024 bytes
SHA-256: d2e0e36f28e132c5fc00aab5956c6d4399ab4b9f3a51e87d229b91a0ec6f941d
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10784 bytes
SHA-256: f8cee61e4b329fb0403d02c5c800e8b643db161df1ffbbf1e6ae4f888542e2c3

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