Malicious PDF — malware analysis report

Static analysis result for SHA-256 125d8449d3813cbc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 22:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cec96cb3d75ce74c4dd86c3fcb3a9a33 SHA-1: 5375ed3d9db6e1e6456eb47c6f81a430c0fadb7a SHA-256: 125d8449d3813cbc2983c26314ea07a0f8f604dd6807ba0c4514909ea955be7e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of a 'download button' heuristic further suggests a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=king+of+fighters+mugen+apk+download PDF link annotation
    • http://madurastones.com/userfiles/file/wuvuzezaxetutemupemox.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9f93ebf3---29181249598.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/323d30b9e16345ae789ec3ebd206345d/25173095063.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/vadovunuki.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/72224574d3e77d3a155ac80dfcfce0b4/mifod.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sazevedonajunobajivo.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/pedenanozozov.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/75616548444.pdfIn PDF document text
    • http://sivam.pl/files/file/tobevunuwuvude.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/54083077985.pdfIn PDF document text
    • http://sun-tes.ru/files/file/tisobi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614472269fd9c---93271802353.pdfIn PDF document text
    • https://network-italia.com/file/76247586725.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/rawatixani.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/44588295183.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c7c67e4bbcde104c12d991fbe86ee18e/nunok.pdfIn PDF document text
    • https://webrobogo.hu/kepek/tatuwodavififexibijudadof.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/49420788445.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/70014687848.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/63176178484.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c90bbe1648---raveromobazete.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/limekoberapika.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/binobelubokarumonaduwop.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/petof.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/woromixelovagimabulozek.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/10780860490.pdfIn PDF document text
    • 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_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 17408 bytes
SHA-256: 198061d45b3296bb4ef3c75d1fae98f2a0bc6b9f4f47c9cc48832ac9b44cb9e2
font_01_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 11212 bytes
SHA-256: 3bf0b273201239994ac93612ded3fe297242eceb67a83aaff0bb251d992469db

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