Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5349f2b85957ae3…

MALICIOUS

PDF

133.9 KB Created: 2021-06-30 00:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d98d9da91bb7ed01f73031854df300fa SHA-1: f75661acf4f2a1d2b9db61f1a2a6b41eeed7da84 SHA-256: f5349f2b85957ae3ad39bd61ba1cbe0d8aa50279f93a434157b827537e51251b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads. The PDF contains numerous links, many of which lead to WordPress sites hosting PDF files, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/630461639dddac5157126231e4b8d684/56990633335.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8247cd884---7128891593.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23b691825---97057570475.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798d84b4761---32156554074.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/49154624767.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbf1097bf2---jabomovatikumizubozowure.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b7b51aac57d689e7dd0aa267008a7c61/90044786593.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/82868374489.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa9f82a57---71568711731.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4002c9a467---4078033118.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/14522838521.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d474ba3b2---64297196128.pdfIn PDF document text
    • http://sns.hu/_user/file/18746869196.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0cec4328---sekisifokaberapabi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba260564724---5839935869.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d412096f841b3b4300625900c9888c3d/rabakirub.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/47660065640.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/kezotuderirumazimome.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/609832a170a02e713de37d174d3fe9a4/17317505345.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9025c25f0e704c54627863aef157c3a0/xumesenimokepatibesiva.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fed9c72d62---fazamumavukufa.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/kupukinufupezagupudux.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/885811181.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/11198428810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dancing+with+somebody+else+lyricsPDF 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_off00019ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6F6 21888 bytes
SHA-256: 74ac70730240e2ed0b28dca745e038e7ff2406d0e4a1856629a93551f82be642
font_02_sfnt_off0001edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDEF 11160 bytes
SHA-256: baf222b4d4108f7c2e0f1f99f09296b9fef9b638890250bce0cc9c877346a28f