Malicious PDF — malware analysis report

Static analysis result for SHA-256 b823a79b553307c9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6666f8fd4eb2319ae564126903f16e39 SHA-1: 1931632ca1b3a559aaa1d42e240fe3f04bc3f87f SHA-256: b823a79b553307c99bcca8e128a0c8f5258600b60a95cec89dd7e7115ad05636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca6bc096f3---40814424742.pdf In PDF document text
    • http://revucue.com/ckfinder/userfiles/files/67688277117.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/14751830961.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/92842198645.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210923_101628.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/murutidekerir.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/18637532110.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d22f2de2d5---fejanibuvelijinos.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/fowebubugemawamunoru.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/63833226618.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/87168124781.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/61884b80fb0595f205f98fa7082554a6/zatuki.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/11124209244.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/43332889621.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/12809368529.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b09197a330---nirovilonalasobekowisusot.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/dewoxadivogegiw.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210920_115039.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/xigavotubowigenoluwuri.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/tituzopugamajutomemuxi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/43607638449.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/12122866110.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/68756471000.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6bd04f36adac079877d24973f5802e6d/80350575847.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea0c30fc2---7677772361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+transfer+pictures+from+an+android+phone+to+your+computerPDF 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_off0000b1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 15012 bytes
SHA-256: d7d7936f8483af4dac92d86e058ce79221abbdfa9aee6ad124ea4608db3a1834
font_02_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 11132 bytes
SHA-256: 0bff6a3e8a56fdb9bcb968666d3c2e9c31026f48fef89504ec11155e7434269f

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