Malicious PDF — malware analysis report

Static analysis result for SHA-256 957518566142f956…

MALICIOUS

PDF

82.2 KB Created: 2021-07-17 17:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 117928d76f187c1a774b66a5dd630928 SHA-1: a3294e4cda105c418662036a2d4afcd4ff4b7985 SHA-256: 957518566142f95626dc3fe8768007472cdb73460b9514027cd1026071dbfc2c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0bf24ff2---62339595179.pdf In PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/db649ec28f0e36f55ab08fc99eb0d046/depijoziwejedujak.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/51290759291.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zojufo.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/60077363470.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160811154f22b3---timotesosojizerib.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ca7783ad---53772679303.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/82317fcde9adef1b63d31dec823f5c0f/20626969269.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a078e828ba.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc97888c29---depoxelopapimap.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/79425676316.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fa1e6fd0b21c0d5233358af89631b482/wutile.pdfIn PDF document text
    • https://aokman-drive.com/d/files/rabirefesakepozapesufikew.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c34c0f36788c2a4f2dd8da6f706d45a0/87957193438.pdfIn PDF document text
    • http://aweibel.com/Photo/file/bisis.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/67523386040.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/govogikozavo.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/dutizazezupufidewuwigaxa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988669b441c---55801920199.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc464ae5f---sogukunijut.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/n6plkkssob9fmjta0gtqi9p3js/pedolitufevufobafumofuk.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/nalama.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ebf7a9faaa7d7d14d0dfada3fec39374/godogibojibogifom.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/vakexisifozasaduzivos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=free+charity+responsive+website+templatesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 16980 bytes
SHA-256: 2c92cb994ef193dce5c252371bc5392861d2eccc0c1d9943dcd52710a1810f51
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 11024 bytes
SHA-256: 772b427a256f39a0fb3b5f1318c05c99bc6b0a47909bdd00732ea5079cf52959

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