Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ef97524491ce15…

MALICIOUS

PDF

93.7 KB Created: 2021-06-25 20:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88e8055e642335865907ba30a6532089 SHA-1: 12d1d8a0881976c8136a317fdf73e8c8d884e964 SHA-256: 72ef97524491ce15b729f7e323e4fc8227e12227ff8518044bcaca07776f8847
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary attack pattern involves luring users to these compromised sites, likely to deliver further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2231c55fe---80434623926.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/24d6d3c60b037cdee53af27d9acc5ad7/98353315374.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/453e9db204ed1c400fb0a7fb6953278e/nujadonagivenejo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94fe5acb3f---vexaraxesaxopatufujama.pdfIn PDF document text
    • https://jetaime-shop.com/files/nemipowurepunebevajag.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f3eda8e2c---89131868561.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0800723f960d66187289132e1972e190/23941346335.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c3e4d37c6913d051183abf318a87fb69/33830305232.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a6b01eb44504b1d43771ad15d7732f12/fasawamifizefapolu.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/vepafowolupu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607830c07557b---6103554280.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0f11343f019ed42f6fc62f4b3e56b49b/mesokesenapipo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f80f2a7ce---pajeponiwulofatu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db93332d8---bedelinejetuzusaliweruz.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/93538b5b03d18329e00591085cae9763/renoretam.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/12574838478.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078175a058c1---roxejifujadejezixevuxomos.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/85571276405.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45b8178bd---wuduzozopa.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a7bc4835---71896307554.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/pobav.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ceda2ec6---najalumi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c8fm4hma1obuvk62vjd5jb0oau/58440906129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=one+week+after+quitting+smokingPDF 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_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 10960 bytes
SHA-256: c33bc2568d1f3a2b612a68d3c8b7cd26850a4307d099c81fab50aa659f78a463
font_01_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16872 bytes
SHA-256: 584e01f4d45aac8f5fea88c3c4037d6f28432533a6a3c7a2db43bef385a2ea9a
font_02_sfnt_off00015160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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