Malicious PDF — malware analysis report

Static analysis result for SHA-256 963ed1f0d625c046…

MALICIOUS

PDF

89.2 KB Created: 2021-09-24 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bdbbe544a146529e3b48f58fe0424b11 SHA-1: c664f13a355ab87d5b7cbda9e4068944ec05991d SHA-256: 963ed1f0d625c0464a8cbd195d1641e937a47fc668edf369de91750f00f9d1bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The heuristics identified the document as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://curvy.tw/upload/files/24557141766.pdf In PDF document text
    • http://sbsinternationalschool.org/userfiles/file/buseno.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/2471129505.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e29cad64ed72cce9c0aa3cf64deadec3/94567458532.pdfIn PDF document text
    • https://theipbuzz.com/images/file/lejuvuwuwodexi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144a0eb34c5e---81785646525.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/81717866709.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/tagisixowalasozedanoj.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/9158427306.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f13e06d9bd2c22cf0ff3b3e14731fd8a/98829067125.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/69728590649.pdfIn PDF document text
    • https://umartravel.com/files/dirukapu.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/45492006007.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/9984089817.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/gebufasasijib.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ginobab.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/bufolo.pdfIn PDF document text
    • http://altus.pl/userfiles/file/kiseruwawekawozegujatifir.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/50100312792.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/8854909648.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e390d0c877---73841209894.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137488b68f5d---61627786616.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/37063219950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=strunk+and+white+elements+of+style+pdfPDF 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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 18380 bytes
SHA-256: 8096966170dc3a05c388b540893f4293f919ab5ac01b0f67f430920841154ac9
font_01_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 11228 bytes
SHA-256: 70b2d032a94fa5c80901a9ed13ce89dcab4501fc3801bb7f781de26d6a06a21d
font_02_sfnt_off00013f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1