Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b02a80677b2eef…

MALICIOUS

PDF

82.5 KB Created: 2021-07-31 17:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 186491f1848219cbfc334d7ffa3d7aad SHA-1: 037005fb4e9ef3166b28e5345d4f66191637f69d SHA-256: 48b02a80677b2eef0a9aa5056ff065f8533f6970f43ab4f26c6aa98252c2cf2e
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs that point to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to external sites, which is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6b622d1afd5545c31d8875cdd2005c2/disik.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81c904ffe3---jogesuziwusujuvupemome.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52dc56b78---zovumo.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/16548995299.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/jegixugasule.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a445d9d7c0---dinupob.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/0ul1r6c40tokaersdt87q57vm7/wufukofuxilunatomavus.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/misenurige.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/paxelax.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160859dee7d201---81369389151.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/salizomasog.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/nalexu.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/53581612310.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210716_DE64EEBA68D9B210.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/mexidolopomepeju.pdfIn PDF document text
    • http://coclub-us.com/ckupload/files/9304900898.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/foviwawe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a563bf9186a---24251481413.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/42965739537.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/f49voqa02os5bofsav9s8rk7hb/gajepikigufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=carx+drift+racing+mod+apk+iosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 17576 bytes
SHA-256: c20af49ea04434971b92311b0253bd29568397bcd1d43d29212632d91273264b
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 2400 bytes
SHA-256: 0c3d260a984c8f6d2a3480d7bc7b97adf5f575b765b84598c5fbf3e5d9700cca
font_02_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 11012 bytes
SHA-256: 9295e7625345d48f615fae650d91462ec556e8190ad5e72778784cf6da1328af

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