Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb50002c1fdfc8e…

MALICIOUS

PDF

74.4 KB Created: 2021-06-21 01:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ffffcb32ce8674061869a9037b1a5e4b SHA-1: e5a7415704d749fc8c4d82e96d4707ca9e27ad6c SHA-256: cbb50002c1fdfc8e27e80e68c5e5c2a56f9fed30ce213ce6f15e9ab71c1f89b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or lure to download malicious content. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=jass+manak+status+video+download+mp4 PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607617125af5a---wofuxumukoxole.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/67538825622.pdfIn PDF document text
    • https://hojoairport.com/images/file/divuvade.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/6c7d6a7cf9d44751e28118c597e7b529/78020863717.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/2fe474bb81626b6c7921fea95651456b/71842536224.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5323698f7---37688950139.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/sipepemuzabezonavu.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/pla90kuaq59500v8r2g2hd44f6/72372438117.pdfIn PDF document text
    • http://rilta.net/userfiles/files/33679905715.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/63327690605.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/61154468266.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/63314494223.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c422bc6acd---bunupotekurisojazepazok.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/latokufovutegejem.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/a8faff762eea123db055b791d87c23b5/41086697449.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b20654dcd62---velizefuwulikaduzigibumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000c67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 5304 bytes
SHA-256: a3a0cc4116ff9e9c84d494fc0cc0d8a7b9310a78cda5b33e9424882147308303
font_01_sfnt_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 2244 bytes
SHA-256: b299de69e66b3436fa76b9b023b5fd3b7e75c5866187ac0de208fe8d67db69b3
font_02_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 10444 bytes
SHA-256: 9294cd251b7b39a62452a656bea259280d0e7f408baec526ac7050ed6fbb0098
font_03_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16232 bytes
SHA-256: 05c5eedb89e3e73e3c7eab1087ef8d20003cc4dbef32e91d64b3ee9f266609c9

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