Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e50243ff0f1fa81…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 16:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d430dd603c6aeaa9e67a82ae984eff74 SHA-1: 80afe69e03297c111e09ae84c6141a1bf83ae7f5 SHA-256: 7e50243ff0f1fa819250ff7c403fb85f014e32c037230002b21cc31074370f0e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sportnazona.bg/f/uploads/files/lanudosixetokewuzeri.pdf In PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/96543388147.pdfIn PDF document text
    • https://senhewood.com/d/files/94033229611.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/nemawiluvibabi.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/15309224889.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cpabrc69vpnm0ndg5r7ned0jl0/11368878190.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/tikelibifidovigavi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6afef15d---83981321583.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f086239c79---wugizajodivurubuxokuneku.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/84459313550.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/jaleletiwaxukamudal.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/43186653913.pdfIn PDF document text
    • http://fohow77.ru/upload/file/wetukafavifuvesatoxisitoj.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/30596046622.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c4f1f0fe---1151668479.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/66180915034.pdfIn PDF document text
    • http://metal-test.cn/upload/ckimg/files/202107292351103261.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/af312a377253d8855b3540110dcfdb35/63722445463.pdfIn PDF document text
    • https://superpart.com/files/luropenimuketobazoleli.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jql4qdv6n4ajdgpif2h8gobr0r/4224924675.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/rinipugubajanelej.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d335f6ca0a---20642668364.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cddbdaca07---sizafekebosoxuberudekodil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aviator+watch+f+series+manualPDF 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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 10832 bytes
SHA-256: bcd2338dbdaef412c6e10785f7fc6e570d6621953eb07c5ecb17c27902960714
font_01_sfnt_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 17900 bytes
SHA-256: 46e1cfc39e16c9d94992b6e5712bcc2b0a46fc18422da9509250775233074097
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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