Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea8b81511e30737…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 05:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a13870f68d2180df3406f8c0291db56 SHA-1: 6b4a5e9031a54a7521cf8f776e0e3dafca5dcb1f SHA-256: 4ea8b81511e307376d35570e752a3a4ce2b8a63502ddd5c35167fae9092afae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=materials+and+design+mike+ashby+pdf PDF link annotation
    • https://agrilaui.com/userfiles/file/zeperizizaforid.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdab0861e---dunuwoge.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887c4551a24---87686807652.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mesoxovozux.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e9961cddc---ripok.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/vepusunukevogoti.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/41993452087.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/revasuxuvowupaxibozuf.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/58737137590.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/89974822121.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb65e569f---93597336451.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/2539186271.pdfIn PDF document text
    • http://cosyromania.com/media/file/xitukunomotu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/14533705284.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/mijivadinexija.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/rufemezoxuloxetuxarevelu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/13861024055.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jjf95tbugjj0mo029qeugss5o4/nujabesi.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce8a1a851---xufisafafex.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p65koqef62gtsgll8t1frj93kj/88652943986.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/suxexuwolelig.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/8883936629.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2356b358---lafokizozetukofexepaburuk.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/68685621598.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dab8e8a77---tupig.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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 17816 bytes
SHA-256: 06412bd9dca6853d50e72c07727d22688b73e2bd46063a5b81870ed5b6b1b261
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 11164 bytes
SHA-256: b1b06df87e0ba79f9b6e8c2c13aee283c100208c0a9e480a5175b3fa78fa43d3

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