Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af0d92022a00be9…

MALICIOUS

PDF

85.3 KB Created: 2021-10-12 11:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bdb33ee967668e0b46340e7fe6500abc SHA-1: cbbc65029b628a0d4f88d0190184efe6c04909a0 SHA-256: 7af0d92022a00be943c2493c523d013be57f42eaf26c20aa10f4fac9832ba280
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to external resources, with several heuristics indicating a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing lure to download a further payload. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://biosystech.com/pdsFck/file/rilapejiki.pdf In PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/pupasa.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/44671763829.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160ca6c0328a---zavirexopodutorisev.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/31320835481.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/guriledojozaligidijaresa.pdfIn PDF document text
    • https://dukumanis.com/contents/files/salejomuzo.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/3677118465.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/67971442590.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4654f672f0d5f4684a26aff2e2ff0cb7/nubudavez.pdfIn PDF document text
    • https://designclarf.it/file/36332704754.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092218520710.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/41222422075.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77088390884.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/dejitijijuredepizofot.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/56755222647.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/26798806139.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615938fccb7a3---60348993435.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jifavogikinaja.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886d4c1c57---18135931107.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/rubenus.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/munobopofekova.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/wemesowurikezevixobose.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/605219934.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/kezezuku.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/69658049098.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/lugobewowabukoguf.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=qdoba+catering+pricesPDF 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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 19772 bytes
SHA-256: da5e8f4fd970e6d004df24cf72590b320d81badd123749fb3ea840117b985edd
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 10844 bytes
SHA-256: 8bae7b58106822841e07efc8aacd6d17d2d04ed70e33f5a1a2f29c9b98aa4473

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