Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4ecdb735311e8d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 21:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70181433f06d3eca50886c737ac91289 SHA-1: 1dd9474c9be2dcf450bf091e6735914c638a10c8 SHA-256: 8e4ecdb735311e8d4346b08ffe238431a09c0a173459e5e0a67caa1089c0cad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://fusiongrup.ro/userfiles/file/6418424083.pdf In PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/64937666602.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/56304601145.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/10159258808.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/wamunowisulametenugivepi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fv6iiohjvjivrce41vkejlcr52/55382154184.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xesajobirexebiwidumiwo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/sisoxudigedexuvafa.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/70804856545.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b6ee03c2---75364697962.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/wewiwuxisiboge.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/vubepetokoneviro.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/zawaruwakizola.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/xijosulerinubajorodetet.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/maresekumupamigefasasow.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903095117.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/87034586278.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/gafupe.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tilif.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614817b091208---54043882788.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/jijubika.pdfIn PDF document text
    • https://badrivishal.com/media/birozukab.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313feb3e481---43280123928.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/xabozapidumivef.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/kadukasaxuziji.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/rilagotumakemepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=king+of+fighting+kung+fu+%26+death+fighter+mod+apk+unlimited+moneyPDF 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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 17956 bytes
SHA-256: 41c17219475adc4ee30734e7739f51615b1b35b550a96ab3bb0f8c2c28030e84
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 10068 bytes
SHA-256: bbf507be3e53903dff31031343fff7cab446c23397f570e2b6f7c039778f4927