Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c3851ba53c3c5f…

MALICIOUS

PDF

62.5 KB Created: 2021-09-18 05:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cff4a231f06775c65fc5010606388820 SHA-1: 534c38d74589a8f84ee385cac6864f3a8fb518d2 SHA-256: a5c3851ba53c3c5f90bafb1f41c031ff110f5433c052a5693913f6193818c353
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://philabc.ru/uplcv?utm_term=root+asus+tablet PDF link annotation
    • https://imagebeaute.fr/userfiles/file/livifezesewufujewelaroloz.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/gikafefinifufozisevuxu.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/58123186523.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/96309388499.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/togetikijuk.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/nolelubo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613800a86abfe---97229626784.pdfIn PDF document text
    • http://partnercable.hu/files/30271396838.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/2090354193.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8c167ab74655b3c57e94a66d68f08cb/luvaluremogozevazurino.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/sutovexijerilafa.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151144562442.pdfIn PDF document text
    • http://teraval.cz/res/file/duwijajolenipezunebotun.pdfIn PDF document text
    • http://philboyd.com/vivudiziji.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/84679333334.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e588d149a8020e5d43d9a25c3d9fb59b/52033055862.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/taxefixo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e801319f3---64828052262.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614382ad999bf---81083373912.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/kotatopisevar.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/tijefolok.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/8537211162.pdfIn PDF document text
    • http://youil.org/userData/board/file/sakafak.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 15232 bytes
SHA-256: 0127ed93b0a5ca8556e7fcfaadd44814b9e303b7fd6d9b28af38e13e4dfa7697
font_01_sfnt_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10088 bytes
SHA-256: bb351fd03903a737bca84ed1964c4e1f7ca89c64c240ff1ba50b754a4651292d

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