Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eba698411656773…

MALICIOUS

PDF

89.9 KB Created: 2021-08-17 22:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e31b5eaac5cb78ca4129b59b37adf12 SHA-1: a8d08b3e78a2afa100ae9113cb44a081621de827 SHA-256: 8eba698411656773de3fa48e3a674b194296fbba86b100f93e2a77c7c7fda72d
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3630d0502f---nigizofe.pdf In PDF document text
    • https://liantoong.com/archive/upload/files/29532696322.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/slcm2qug6gs87bhfa2s99l5prm/71437951365.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/02d11a604b617bbe00b269e8a43af126/86405412814.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/36cl13gjhaua0f5escu0ti5vcj/puxeje.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609760fbd1769---54746344080.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/1926927202.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1180679aed---96611262940.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210726173638.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/dejuwujitawuvivuvitafa.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/sirilegisatox.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/99449811544.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/9194561161.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zinukizi.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/famojavawurapiv.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/021b3e1192d18d9b45f18cc5a3716da3/5691959152.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/prc8oh3j687jbenp5nplhsqs0u/85997895265.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/89997547029.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3daafc2ac6---sokodidi.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/2267215620.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/db94025a93e5db207c0c8a56ba4f1812/47478990196.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32be20ff0---76626208375.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/kotafafavofenedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dominican+republic+resorts+for+familiesPDF 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_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 17520 bytes
SHA-256: c0d529f022d7172c746146afe45bb53eb7a21fff505458ed9ccc52aeaa33c9ae
font_01_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 10884 bytes
SHA-256: c993fcb490eb151a20c9f12b6ff50ee36cde563e3a2ad9e39aa4733842c9da46
font_02_sfnt_off00014079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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