Malicious PDF — malware analysis report

Static analysis result for SHA-256 394703c2ac6a7f59…

MALICIOUS

PDF

74.7 KB Created: 2021-06-22 14:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c836c386375c0510d438111bf3cc0974 SHA-1: b6745222ba70f2b70a84da6c93399ac72a359887 SHA-256: 394703c2ac6a7f59e85764f4b5650120e02d45a36c1e51b5e68fd045d045c361
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites and disposable hosting, presented as a lure for 'Psp game apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a detailed analysis of its specific actions beyond directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a50a7c4ad6b8c49f6c361bdeb874c27/merukiregovosuzobara.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3f294d8d4ff3dc710cd75dee95920830/10536957626.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b82f080b3---29642032301.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wiramumofulererifexigaw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beda1638854---rejuxutuxegopisata.pdfIn PDF document text
    • http://haki.vn/uploads/files/xodotorewerilovexosud.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ace2fbd7d3efa2f18a42ea9de1008e44/69918166422.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f673c00f00---45849047123.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e992efsav7tor4ujb6oit5cpk2/75669730093.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/sasubabefelizulumuk.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d38d98229ee60b2234403fc78364bcb4/dobuvosejoxinekesarajepag.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4d160b23192f9a741e6e85c783fbea2a/23485001265.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718cffe4145---14555784919.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cd1841ea2cfc6dd515d9ae0135f9cd96/60095262992.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/22088332912.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607060c15c229---52404987541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=psp+game+apkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 5076 bytes
SHA-256: 487d2ab224f2e116408baecd153b0f857f7bf1f7de5154fd4e4270a17633dbed
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 10728 bytes
SHA-256: 63dc7f89929e0160f7e7c2e2b2f6547c8b38964d4daf4ec98286ea8b844db55a