Malicious PDF — malware analysis report

Static analysis result for SHA-256 385525d0e36bccd1…

MALICIOUS

PDF

79.9 KB Created: 2021-06-24 07:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e36867794fc2e7418d46753811205bd5 SHA-1: e2ede3eb60ad1cdcf603ffdb4e4466e1a5bfe569 SHA-256: 385525d0e36bccd1e65035d5b27e1be0538f7f45e929f6c2752fec2e5bec3513
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The embedded URLs and the overall structure point towards an attempt to redirect the user to malicious content.

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 https://bamfieldrental.com/userfiles/file/vozomakudafizosoj.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/02aea6e299852bef5e78e92c52d78da0/dosakurilumabem.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb4168ad7---japozopes.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/12305826692.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/72792954723.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/76250563543.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/89570689384.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c8d786a0d7bfbd1bf9277413b660377e/67733117565.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210613040939_2511l0.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfe91c6c16---9968584158.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/10b507061c9ad4a5199ee27bc0e32f21/vufixifusav.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xajatofanokeka.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed813af64f---14200513447.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ncsug8ddpbe2oeu1tf8fbd3jg1/falumemesexibagidujapos.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/borogedezufakagipubavaker.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4a99e2838c8989ffedb4482ea79b1b28/zedifukut.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/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=modeling+a+gene+pool+lab+answersPDF 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_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 5364 bytes
SHA-256: cbc2425ac6b754c08c4795b78de0c32935aa108ca2bce564a25ca96fe3a83380
font_01_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 11448 bytes
SHA-256: a8fdeafcc9ac33f4f51772c0136c29ccfebe472641eb7159d3d5286f331283f5