Malicious PDF — malware analysis report

Static analysis result for SHA-256 189f5664f2bc9729…

MALICIOUS

PDF

90.0 KB Created: 2021-08-07 12:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76ded381370abfd386a02d3131b5d26e SHA-1: cb4dbe71d179a05ed3cce00c7f47ab22e02a2168 SHA-256: 189f5664f2bc97295c06c048a3136ff7a261464fa8fca1f4c68a441e5f4565d6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63cf1f65adda854301e832a4904a8beb/xemutisogimaboxukex.pdf In PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/tepofirureg.pdfIn PDF document text
    • http://sukhabalka.com/files/file/55089378844.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/ffa657340529a80bd2827c0d0f1b9865/53188580896.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/34071922092.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/73577994607.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/furirotoweluvazidale.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/noxitapijunefosomudoxoki.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c96ea5ee093d1a9bc2e4375fa6e54501/5074322882.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wizadadavovarodireje.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xurivimejijapejome.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607208192514f---51563070485.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9c3903d2c9ca102f0a0a05fd474908c9/rowunanikaje.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7544f6cd20---46896821229.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/19733591576.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/46741252026.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/sadakizarej.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3981921814---93340442918.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/15479ca9858853a3062e70df387179dc/20982474150.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/74843004640.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gororakokogigekevemirepol.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dc9b216aba3360cf8acef3ac1898136/23675298031.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/76d9b25d6e512cec1a9fb4c61fbb59f8/51421910112.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/11246770220.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/vulegaduzusuwinoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+reset+my+dometic+air+conditionerPDF 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_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 10676 bytes
SHA-256: 9443172fa3bbbe90a007922460bc52c047a041ecbddf3221cb3f4fa2e521de6e
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 17180 bytes
SHA-256: 2848fc9d871f2c76c953f45e312301b3d3d43f457500d3317e0b615048184c10
font_02_sfnt_off0001422a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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