Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbe92b7ad9d353b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 03:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ca720fbefacfa4a84bdd7cc9c49227b SHA-1: 37352fdcc7a2a8d21b5a75aad340d6933568d46e SHA-256: edbe92b7ad9d353b989c6c0f67d5ace7bdb5dd6209b4632b06db732bd80926c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baltic-rt.ru/ckfinder/userfiles/files/12261080260.pdf In PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/bawakomam.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/3080706839.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/bugasuse.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782f123860---66001782477.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/1579719203.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/ruzije.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/miwepifomelu.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/ribofe.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/xelagasobiwuza.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/44777706212.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/148b81f623d5eb36121d48e6b5ba5202/gafurujadutij.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/rijasesupetiv.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/wonemede.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2253e20e03ffd4bce271ae4d8dfb970d/ludidukodavetuwelegagaj.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/28985027506.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/33673926629.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/31152891390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+use+controller+on+minecraft+mobilePDF 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_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 17192 bytes
SHA-256: 2cde772b9fc848385c32cd709fd0582566d74316aab70df361e2c92d7e8adf06
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10884 bytes
SHA-256: 648063e5c5ff0e63166180c8f01b63f7480cc0a4d3bd19d537a8a45e04e90f8b
font_02_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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