Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5991eef18da983…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 14:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4c4573d4c87f6a12f2f3d8ef973986d SHA-1: 4ed6b793340b9a37250add861bd34a2842843a12 SHA-256: ae5991eef18da983b31fe35ccb4896390d9bded4e81e7fb24f9b1214f2441aca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, including one hosted on a raw IP address and others on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, as suggested by the ClamAV detection and ML classifier flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3ac10fd5b2830eb0156ff2a356855a49/28183142524.pdf In PDF document text
    • http://casier-a-bouteilles.com/file/menofi.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/rutuwulerem.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/77530216638.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071435ea013d---82021357781.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japadovo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd11f9809c---jujavimovazov.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fea3ac4fa5f665ed75e3abf57d182401/wegipapatasoluv.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611457431e5ea---38748325269.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/26ad1a0dc7c9a27910e640938da1e26f/puvezufokoberovumu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/394c91cc3f87cd4c994d9b93872fed00/gorosezuwugazeluk.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/mewixunoxekikebamol.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/26120587603.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/bofizi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e338a1e7e7---96980866533.pdfIn PDF document text
    • https://pecsikult.hu/files/file/65920541415.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b985dad4a9---86427514199.pdfPDF link annotation
    • http://myucmas.com/userfiles/file/87659294411.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/fudobepamipajep.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805dfe1d25c---lobivunadimugutazadutov.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ib52987mda2savsrrkak39ak20/57000203406.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/fuduwatufuf.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/18672925782.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/57950587017.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/76027695806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=embedded+c+programming+examples+with+output+pdfPDF 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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 17988 bytes
SHA-256: 32b2c1a075ef522f73c10e50d68e414aa0be377b47731b7c217cf571b619c268
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 11476 bytes
SHA-256: 79811ffee367c9d156b2103aaefeaa386acf7f58bdaf06f522e616b8413c964d

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