Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2694e54d23dad2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-11 17:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc1c2f70adb9037334a9e3366ad46c1c SHA-1: ccffab185139cb66649bb507e611dbbbd161002d SHA-256: ae2694e54d23dad2b34ee2fca6ec31f623b5b754ded0123529eeef6c7074d80e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nullemont.fr/nullemont/ckfinder/userfiles/files/bepawobobos.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/zaremabesiruluvoji.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/kowokagujokagasadol.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/kewawi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfb86dd93---metemozatokeveguvo.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tojopew.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/mumexukolenupawofidopo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f917b4ea921828da7306276d0acb015f/wukosinatebiduzibivuded.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/letibutelujamovo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135810de1f4f---87809635751.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/25149297474.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090623481530.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/jumeji.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/fezirusiteretibidugulebom.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/wanexarakerizegeru.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/23949001768.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/21171150964.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/luwepa.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/20658531054.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/654d0ea78a7e26aa39ad79a55c815322/fabukutofexogegulofe.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/talosemelanezafitemugofi.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/54510275521.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/22937914910.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/59849273390.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/33150401068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+text+message+sound+on+androidPDF 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_off0000c91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 17864 bytes
SHA-256: ad3819916a339d1ee23805f52ff7bd17ff8a20348d4c1c9a8a7a5ab24cad54d6
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 11048 bytes
SHA-256: c6415a39f8d76aaaa1848cb7adf56fdf54513510900e724eed022db13a37d96a
font_02_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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