Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c3f3fd96aaf8c0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 05:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cdfeaa9470015e11e70b4053edfb4ef SHA-1: f1b8e0b99a9089d84bbbf8ff049e371aafcd25e2 SHA-256: 90c3f3fd96aaf8c00616257fc7e2256520ae03b9024b2bca2f356dd3a064fb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sensiblemachines.com/ckfinder/core/connector/php/files/52320469193.pdf In PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/47558647236.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/dametaji.pdfIn PDF document text
    • https://visualarchive.bg/files/xonak.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/goriwitugepiborotekajofo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/zuvefiwavefululu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/43928993303.pdfIn PDF document text
    • https://il-gusto.com/images/file/71546976276.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/25047997997.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/numome.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161400f60da2e8---35891811039.pdfIn PDF document text
    • https://projetovm.com/uploads/files/tosetajudugezedimasowo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99d1dbd7b---gejiwejipupige.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/75292969126.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/90919715376.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/naxivafi.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/17380105223.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kutekarasoburivowa.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d5f5ca59b087edbaa035e5195a8965c8/suwokileladi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nizuredu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jmf1n4ic000q2pkft4ci135atn/raxadesusizadabu.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/gegax.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/kipagepuvanewomo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f9bb3265---mugaxukazarevid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pok%C3%A9mon+gold+and+silver+gba+downloadPDF 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_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 11032 bytes
SHA-256: da83938cdf19c0e78e6e4b7aa07d76ab4e5e88099658a986c82aaf10e9ede6ae
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 18348 bytes
SHA-256: 468f144dc634cfad0e3d29b31007baac70cc1ac359ada37dd210de7038211b17

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