Malicious PDF — malware analysis report

Static analysis result for SHA-256 732a58b0458a95f0…

MALICIOUS

PDF

72.6 KB Created: 2021-06-24 01:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2bdf40eca62de6e777a3042e221eb53 SHA-1: 84eb8f62e810d79a4c013b4705be976e02ed9fb6 SHA-256: 732a58b0458a95f0db8258f8e6056b5e0e09c3385d82480b983ec53a6a0fb11a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af2cb8049c8---ralusajila.pdf
    • http://poslovniimenik.net/firme_data/files/23586610800.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3b00126b---fololamobokadaxajozip.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vk8pvtoo5qv39r0ejkkn2p67a1/veduxabe.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/m9vu50rvuk9h6j0317m3t1bo1h/xafajuvusepi.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/9338012443.pdf
    • https://ilcaminodaugo.it/file/moxamiromisizokedunulijes.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8992cef2c2---85310402555.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0acb2f6e402aa6b156655df0e72787bb/65315453069.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097d8fb2b8a1---38069091837.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7bc9eee9a6141bc7a52190cf2781c3d8/31105710445.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094c65f86066---kuzajetulexozopo.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/g6ffibvc4a1scia6f7vashg1l7/21922800610.pdf
    • http://hopkins1983.com/clients/861771/File/57283428793.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/amm6fr9kdo5gas8sedl9dsfk63/tivarijakititusolox.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/800aa98d58145f4ae8cae826bcac3cfe/rerugufosezifip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=icse+class+10+chemistry+book+pdf+free+download
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da75.bin
53b8122f36f4d218f5c2a1272fbaefc7bc311f108057075ed73003e048b5c6e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 5924 bytes
font_01_sfnt_off0000ee8a.bin
5a3d49033988b4d0dd20f562358990d7f31f71f6630a985ee75feddf2ffb9d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 11460 bytes