Malicious PDF — malware analysis report

Static analysis result for SHA-256 277e340b5933e892…

MALICIOUS

PDF

97.1 KB Created: 2021-09-20 00:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ea5433b145e870ae3965460b5b3a82b SHA-1: 8537aba9d52e13cf4c3e27564a52791ad16648f9 SHA-256: 277e340b5933e89220d3160ae33988331b467b7a90ef8068340efc31a34f5629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient evidence of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=ice+age+2002+full+movie+online+free PDF link annotation
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/57407098287.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbed17ad9d---kewagaze.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/21675523107.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132933be717e---pajiputesiga.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/nowiwejetiwijoxe.pdfIn PDF document text
    • http://devveb.net/userfiles/file/54809590288.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210909_188E1861C8A3504A.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7ba031c1bbf23cbf2ef67845d12acf93/87279966155.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/84401179137.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/85300377280.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d5b9ac5e---3359327677.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/29994026390.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109131315592134.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zufarabenisalo.pdfIn PDF document text
    • http://abwva.com/uploads/files/48031179625.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/55157082533.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/41909272412.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3cf9d1b08---78828920359.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/26849432961.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dd5fbcf35---dafopav.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141b0f407dcc---67471780573.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/66682126050.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-3/20210903231540471931.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38ced5587---60280002255.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_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 19472 bytes
SHA-256: f47950feda8e93762fc27375c3e16b09659da6ff271daa705a1e1bc9a1577e53
font_01_sfnt_off000145e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E2 10772 bytes
SHA-256: 41036642e8b29da95a37c099316e65ce7bab11a497b1eb34c2da2add4377c675
font_02_sfnt_off00015ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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