Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3773c15781ed55d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 06:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac363d9d1b1da038b117913906befcea SHA-1: e7835fc7586b1ae304f22bb7a4ad726beb38c5f8 SHA-256: d3773c15781ed55de4710755e1a0a50a6106337a5e668f23478e8bfb8f9b0034
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k21ossj4nrs570gacflonh2pe0/wojorakewawolofutovuzurek.pdf In PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/60359068638.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/kso5lmor5erla9v2uppnpcng6i/13361496379.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba3892f7---logovafe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e8557bfd---87405116813.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/vufexalavasukojipidubiber.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/zemamixi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942e364130c---kipejadoludemidetarobaxil.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/dunowikuwe.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47b998558---pizidivigivifozipejota.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8c4903u21tncjvgs6cn4hl0v8i/10085044815.pdfIn PDF document text
    • https://efnnma.org/files/file/lugixivesileweporas.pdfIn PDF document text
    • http://tavio.su/files/file/99168455967.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36dc05244---nomilopuduzil.pdfIn PDF document text
    • http://usmleworkout.com/files/file/35339933190.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/92034920596.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/62834819354.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec0fa4f276---womaposuxoxod.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021082320535873499.pdfIn PDF document text
    • http://gdfsztal.com//uploadfile/files/bewosugifekug.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e0d3e152e---samupusarerimozez.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/49020341031.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16121c68e30a1e---90681193154.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/34556342997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hark+the+herald+angels+sing+piano+sheet+pdfPDF 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_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 10860 bytes
SHA-256: 822c9d99ccb3e1e816af1b69f6aaf1d16b337cf1fca12649455d9f7afeb13a26
font_01_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 18988 bytes
SHA-256: f88a35ae9a309dab4d564d1376d731a5ad9d63b4e45de4c955ba2994f412d659

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