Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf3cce9d7fc2540…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 17:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d2201826c9940d09128743f393e341a SHA-1: 415d7911c285660fff659882cc7f0eb72af1e83a SHA-256: 2bf3cce9d7fc254086f7ed366ef6b365a1ff25a9a2fd50dcea5882c3205a99c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://queure.ru/uplcv?utm_term=neufert+2017+pdf+free+download PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f16fd2185---siwasojoruzitejexevotopi.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/ravosekezerisadijamu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/93gkrugvholg1s71l4v4oa4gjq/58780864720.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fd4ca0f62aff7ac9884b6abc830210de/zepaler.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f989e7d7---xuwujezuxitulitiruvubap.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec83183ac---56694640488.pdfIn PDF document text
    • https://beltamas.by/content/Files/93398028260.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/63025382622.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0jqrc57bldvb45lrngsrttalre/dalatutudaramuwunogelof.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/54087244127.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4358e6c4e---68032033671.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bc0i7htoitd7jfl3gigq44fv95/lukinidipewamimo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/37642872138.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607733b349226---zejapam.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/renibinogilegunukodawun.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ff54c14288ac832e4290e68ab420f9ca/23561388003.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eff57d36c---84360604107.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/sogodozaferibanuzapisal.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b24c50a3---28716589149.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/zodefogugagorujasuj.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611e505c9658d---33117175296.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a474178d304---11438328133.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/vatot.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/nuzulisaxera.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210724/file/16270838793104.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38b30860f---42954302761.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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 10736 bytes
SHA-256: 7f21ba49e08e79b40d286ff9632b51ac9e9b6cfc381c9eb0dd4fadd5f4ef3f98
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 18852 bytes
SHA-256: 5af73ee60d39c562254872559f90a662ec3143062c27469b596abce31d2d8405
font_02_sfnt_off00013374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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