Malicious PDF — malware analysis report

Static analysis result for SHA-256 3847891a68e1bb05…

MALICIOUS

PDF

96.0 KB Created: 2021-09-19 00:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 81e897f9773daf778958dc8347eeb47e SHA-1: cc6d505039a8777a1840d0c352ab6964da1a2255 SHA-256: 3847891a68e1bb057048b1bf1207dcaa01acd3b44eaa0d5b9b22084cd5c1131e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO abuse scheme. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=pokemon+go+shiny+rare+list+2021', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://oniceh.ru/uplcv?utm_term=pokemon+go+shiny+rare+list+2021 PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b1e322eb---19182025148.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/luwop.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/72173539589.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/44117266614.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/medatolugexuva.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/gokupujen.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/kijuduzebifekata.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/14746078450.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/17018460951.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/51249873772.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/powiteruzizazawis.pdfIn PDF document text
    • https://bak.vn/upload/files/lunafuzokukuxero.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/37498655121.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/57953295551.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a414b4c8e2---23756647763.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/42282317301.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/64803876297.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465a152fdb5---kilavijuxanetilozipafu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0157d1a1---tikusegufilozasedilabevib.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0372abc04---demifuzeterabenuzis.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/pujadomakovirefesunemolu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/55592280a3eb925ecd02b6c053183ea5/81404459393.pdfIn PDF document text
    • http://fullx.net/files/18469777055.pdfIn PDF document text
    • http://belniig.by/public/file/letademixus.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/pobebokigavofisu.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/41325105488.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_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 19224 bytes
SHA-256: 5618496864b7f94a490bf511ac8de37f7bda1566644332c973baa68584dfbcb3
font_01_sfnt_off00014060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15877 11056 bytes
SHA-256: 03448446730e68a8880e730edf49a7ce83079e57ad41d67e8df03be11541bfe0

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