Malicious PDF — malware analysis report

Static analysis result for SHA-256 8599f9d9ddbcdcf8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 01:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6dc76aacb896ac7dc271913e35ffbbe SHA-1: 284586e1ed0fc4bbbb675afa3b979c6490f57270 SHA-256: 8599f9d9ddbcdcf8328dacfdf8c43d22c1072911b1667ed4d69fd49af7212a63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://coretry.ru/uplcv?utm_term=park+hill+moseley PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc34f3890b---jaxiwof.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/94765362049.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/454cd306f4792e64194f65c2bccd5eaa/75792412108.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/74137872804.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/53157336125.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/566c6cb0b62c206e2c08b6484d456713/mivub.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ufjjigsev791g1mj821tdqa57/26706388707.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/12069283118.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/70679645629.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0a38ff9c---toxomu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/56483591731.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/misogutugeminobasi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bd61c24a670---gabok.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/19297177502.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5c2d2a3d06a24f9e194fd9f5d8013e16/78806701274.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/65374963979.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xesuvipipawebujekijulal.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/84155833247.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/zopuduburiwuxetasib.pdfIn PDF document text
    • http://15881588.com/ckupload/files/ramipatatulijegusor.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160832e595694d---pejimokumuwedamenalepu.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zezolikadiwurusevexuk.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_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 10380 bytes
SHA-256: df5d6b96548efcd85722851828d65e7604dda05b199f9a55c997c65a03724a35
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 17872 bytes
SHA-256: 0e63054a28700459fa9a86b1f2c83e80a459425fe431243a188678de85216ae9
font_02_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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