Malicious PDF — malware analysis report

Static analysis result for SHA-256 303e4b69b4a22513…

MALICIOUS

PDF

79.5 KB Created: 2021-06-20 22:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: add39c5f852779aa7c4290e9c46db1d9 SHA-1: 39115e54bd77edc730701d1b2e45ad2e424f70eb SHA-256: 303e4b69b4a22513f7d4f08429b1de6b546f96592b1f91f05a2e30de44854c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to "meteor garden chinese drama watch online", indicating a likely pretext to drive traffic to these malicious 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 https://crewmak.ru/uplcv?utm_term=meteor+garden+chinese+drama+watch+online PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ffff8363ab942c86e5d810718ec778f8/50631664087.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20a8b8fcf---86627704733.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ae75e6367d5ded39b9883581f5f4d663/mozej.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/wekekiparugij.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9206j213une05vonlg9ljaivrp/lekijagazo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wirobowawogesokepigepafow.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/95042560648.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaef4927d---divemufesenikut.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5dp921hmfclurn2l3o6hsbci7/99947935142.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec75b82c0---balututenirezawisodulu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e2986f6e---rarabaruxomebetemamex.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/vetebezemunemugu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a2425f88c4e7c9632b7ce7ecaf583b13/57231713014.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/ferizatiboguvudabusafiri.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2ea218f5f44e05f3fad57032b699ba24/43695511444.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097bf63651c7---xaretodoke.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1868f4c86631214d16005584c9239701/71377397905.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d89d5251e---45911209461.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/66911931792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 5452 bytes
SHA-256: c728dae0eb79e9b15ec7edb05b5759f7922a634035a53b34f7a8e12587ea1a2c
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 11348 bytes
SHA-256: a77711c74cadfa0da353be623a5778df2d998337eab4bfc385882e37490766e2