Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0628aba596559a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 11:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cb62906f0a8bf7f3c13cb0249aea0200 SHA-1: 35fc1febe282ae72fa85f0fa61777bed809320f7 SHA-256: 1e0628aba596559a6023c2cdffeebec53df9fa2a2cc9fd5728f087d0f6fe6ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=active+directory+administration+tutorial+pdf PDF link annotation
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8enu9uh8dqiad2aoe2940n7la5/12731720402.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/17531750575.pdfIn PDF document text
    • http://hanleyresources.com/images/totutef.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a044e61850a---tamunujurozikapa.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/79266900762.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/mezagosovobuseto.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jujem.pdfIn PDF document text
    • http://redactron.com/userfiles/file/25613573827.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704ffa26758---23850297846.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r68kvubdv0ua63losv42dirb6j/kekuzopenezo.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/80684429164.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/73649040077.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/guvirajaza.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/zuwiwiviwade.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/95870038a8e5ecb480d0199302f42644/gulafivatid.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7ff1e884---revowiropafesebokor.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1b86a0249709160eccb84a6b449d2cd5/vonegenu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5f2fc084e---fazexivatoze.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/43731917660.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939cb15a10---56880353120.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/gipog.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607877591532d---33238692084.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f749659add0---28179368770.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_off0000bcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 16084 bytes
SHA-256: 3d7f6a40ee51478bfea204f78a3e7290eb87cffd46fe51ff3d3c61f2580c3f1c
font_01_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 11044 bytes
SHA-256: 77c7252d1ad24a0e4187c8fedea5d5a2b782c625ce906809005b03cf286fcc22

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