Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc7e55bb681e5c4…

MALICIOUS

PDF

85.6 KB Created: 2021-07-16 10:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 04691bb0c8ff53b0a47a6addcf43b5ec SHA-1: 9f1884c65d24da40432bd5a60b9dd6dfb1cebfbe SHA-256: bcc7e55bb681e5c4e1f348cbcb85fe8d858ee869f2b2b0bd25f916ee2e4ee263
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised WordPress sites, suggesting a phishing or content-distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://laborke.ru/uplcv?utm_term=life+expectancy+2020 PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a53a472cc94e416a7c98888b236b82fd/89090815269.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/60285429735.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/83930200768.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/1746104476.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8fb430f---rimulorisuwode.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448f9d8034---pinamakexetug.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/huh9acnm8c1icmtcv47b27oqdv/97025770438.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d76b010c---kamepujetipipenigevazo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ee8c1qn9fdsin29ebjb4eh36ii/wogepaxunowafobidegosim.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729fc81dd70---90925201948.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb894e63fe---13974798305.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/gazidutinazo.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/wuxorapulevumapovuwel.pdfIn PDF document text
    • http://petrduchek.com/files/4526926933.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/op0uojmdlfp4a0c5i730mmpne0/60568926404.pdfIn PDF document text
    • http://htwy.com/upload/file/16684686214.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b971c1b7c8---78949407850.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba335605f---76031856459.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/33066969090.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160787fa587274---wuluwuxakaj.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/genomekonoragod.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gkpdgvtvmiuvebneq00ed6bee0/boxesezenipuf.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_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 17104 bytes
SHA-256: f6799889b56b8b6f2be4f3ee5d28401b3e9cd18ac41181f7a5fd7299eeb32a0c
font_02_sfnt_off00013138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 10452 bytes
SHA-256: ec29f5570a65797fdd53a179aaf7a9b06dcdbcd154018510670639244e6fa38b

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