Malicious PDF — malware analysis report

Static analysis result for SHA-256 9889ed3d416ff933…

MALICIOUS

PDF

89.3 KB Created: 2021-09-17 12:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f2becfddb96b17a956d8fd4a52e4242 SHA-1: 4f2cf8fbfff549d5245e86918172a261f1b242c1 SHA-256: 9889ed3d416ff933f59c01b1cbd71e607c57a3db6fc327b862172d288d47976d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites, including WordPress upload storage, suggesting it's part of a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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 http://scales-center.com/shop/fck_file/file/35119418303.pdf In PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/nuwegudexuga.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b31f3457---32669497051.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/wubutebizatunufeven.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9e671ada---27057349681.pdfIn PDF document text
    • https://alutat.com/data/file/durebegojapop.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/20888824643.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/mepolo.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/52930023833.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/zukijobasofamoterix.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/segaxojuvunojexu.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196141632.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/turenafam.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cfe44c95b5117f911a556e75109b6e7/89460056225.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/mapene.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/pozerakunuper.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/bukajezelosibegezixizisi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70d84309---3979398646.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/27190310556.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/tuwamibinajijevusunefo.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/kokili.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c1a13e34894f6346f548e1cd77df2414/46802224440.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rifureruwuxif.pdfIn PDF document text
    • http://www.bash.cl/media/file/vukipanupase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=back+of+shoulder+muscle+diagramPDF 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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10968 bytes
SHA-256: 5d844e87034e3063953fbd4249b07bdf9e91aa2ecef8c352848178aadb44515f
font_01_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 19152 bytes
SHA-256: 7b6777a0d10944168564f17fa85d9b886ac0cc4e94c589a658602ffe1a30cf08

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