Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b97ec5653f4266…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 11:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50ae92eadd699e9d81c2d3f6753adbb1 SHA-1: 8c55cf6e82af5f82f67dc2be37f88c427b6dc2ae SHA-256: 86b97ec5653f42668e335b2d9a8cfa45cd37acc4a2db18881f15a8fc51316b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI heuristics and the ML classification strongly support its role as a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=entrepreneurship+and+innovation+tim+mazzarol+pdf PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/segesugat.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f1f1f7bbdf1fffa8958fc108bc402aec/30313937324.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/tp0e6f6uj4kk330fits19o07et/zunisedevo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210720230001137.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/levebodarun.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/c7q5gdgfakfjt9pb3hmudr2g7g/luzididi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210704192948009.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/sixoralafisafe.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/80444679999.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/tefakatokup.pdfIn PDF document text
    • https://nevisnews.com/userfiles/29117169763.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f0b289448a5424d64d330f73f6fdc1b5/naperan.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079effe2e1d7---nevojov.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/59128392162.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4f83906400aa9c7550962070678cef8d/rofigilakewatawum.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/zejupuwexisemezapokagono.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/mezezebeduwakirufasew.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67811609566.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/41116433267.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210802060053_1210584467.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/27992100111.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/50566e0f8720790b68ee141459ad4d0d/8547146446.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/pajaxigamikuwumopatep.pdfIn PDF document text
    • http://hidropro.hu/upload/84157092921.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/vizoxenimur.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_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 16832 bytes
SHA-256: 5008c649ab926bc2aad8363316ed9d8ce285076229e172b46b4022be20191365
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10972 bytes
SHA-256: f2e4f37b90eeb4e26842437b4caae72e2491504686efabc95d7a496195b94da4

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