Malicious PDF — malware analysis report

Static analysis result for SHA-256 f056dfb554a59647…

MALICIOUS

PDF

77.5 KB Created: 2021-05-12 19:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4342b6f01abbd0e8f4daa1931fe9f7c0 SHA-1: d411fd8dd50b762873d1d5ee4875630a7af8e6e7 SHA-256: f056dfb554a59647af981b36ed47331ac455ff495fc5289942ae092206754088
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple WordPress sites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially harmful external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bdca78ade94843e5bf18e4b4ea33759f/veritibazigenatepuwuxu.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7b6d8633e2b341ce2553f5bc30ad96ec/mewiwubagoto.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/4f849ee5ab65f2632f223c26b250cb9a/92675230543.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076061713480---72602746271.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29600d9e8---73430349529.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a6e687e1b440a3e126f3def8131823a3/xulevajo.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ae96be28bc404ab8f4a59f547e08ac55/gerafetewixifolaf.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71a42e686---5314421787.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c86722f05---5671089878.pdf
    • https://aterhesseg.com/up_image/file/pevukuwa.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160805090e8762---24382414333.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779730ea042---filobosuwabatadojamuli.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1104e8c737a1800cfe0be1ea73a36f9/sojabefuropinemazagusurop.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44e1c8a27---rijetibu.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d561932ba4---99729216122.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2ea5a4027bd37a96f6296f9001b69deb/99701544914.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffab72a54f---10669043976.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16088aac2e2bf1---32770874905.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=new+assamese+dj+song++2018
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07e.bin
38d41e071fd5d281f1e2a1d90ff9a356eb3d1ecf636ff382172fa91ca1cb7443
pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 4216 bytes
font_01_sfnt_off0000df80.bin
721a5d23e59309f16f8510d31796dd94bda7be226562423f39ad260c1ceb1c14
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5672 bytes
font_02_sfnt_off0000f2d3.bin
c403d73c224ead318ba1f34f7b32716fbd8aa70e13360867551053e5006ae01e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 4952 bytes
font_03_sfnt_off00010062.bin
a2e19f69d0264f33409e441f371b337cf02e6f266ca3b9d8ca2af4fecfea2ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 11440 bytes