Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b87383efcbdd9fa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 12:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 272a71460a35e8fac788e280a244c9fc SHA-1: 6421fc782143226868dd301ae518faf5528fb8c7 SHA-256: 0b87383efcbdd9fae399f5e49665b4994791c6e3179e4e3ff6e9bc040f7cb938
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mch3bhhbgok8sed0ka4grvrodh/37559784251.pdf In PDF document text
    • http://wangguanhardware.com/userfiles/file/58451099825.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/pakobifenojeku.pdfIn PDF document text
    • https://biomisszio.hu/tmp/wovapavuzegi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1c5f437d6eebee3d1d9d76a34927b37a/raruzetopum.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/5324824546.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/wejudebabejemofumamowaki.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7jl6isf8pjvmta14ihee8op618/fujuvufibefevegefezikeme.pdfIn PDF document text
    • http://geneolock.com/locktactyuma/userfiles/file/vipivizumo.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/dituzubanofidu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/nurifodosutamodaru.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/gurixemekeripujoruseteju.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/51744019683.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/tejevutolo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350074b490d---xubum.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/lelivot.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/39341715540.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1r68745ghblsf184pga7b64cgg/xegurijeko.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2fb55b40---70231741858.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/goromadetik.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/69599746884.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/13128918656.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/mutumudazakafu.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/54960178720.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/roworomoxawoxuvaz.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/fejutaligitakabewatareri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=compare+text+documents+notepad%2B%2BPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 10772 bytes
SHA-256: 436add9e16af18dc11282af046d96295dc0ec0ff3cd88798b599aad25d69ffdc
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 18296 bytes
SHA-256: 5e2929922bfa74820eea63e562f34b97868384f3d09e4ff84fa85c612701aac4
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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