Malicious PDF — malware analysis report

Static analysis result for SHA-256 7130ad49739b783d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 00:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7df323740144045d4c1f266696373381 SHA-1: 1d98b81da763fb7353b80a2251b932d79e75e8e8 SHA-256: 7130ad49739b783d8dd7244c34222de58d2f5acecb83591a5ddb3b359dbbce2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files hosted on compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript points to potential exploitation or redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://mdteam.se/ckfinder/userfiles/files/66226778982.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/wugazukadof.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/saradopura.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/vifumimijuvitivabutonutag.pdfIn PDF document text
    • http://healthywithhart.com/res/file/teworuzepojudadiwozonev.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/97100140874.pdfIn PDF document text
    • http://glassick.com/userfiles/file/70125803286.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/51803835769.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fab454c6b---8207959725.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xapedewek.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/90109781503.pdfIn PDF document text
    • http://minerva-collection.net/files/files/jezizadiwemod.pdfIn PDF document text
    • http://yjccnc.com/upload/files/mipuseriwopu.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84796166783.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/25208748000.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/fejexekajanoxezasaxidi.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/67128947006.pdfIn PDF document text
    • https://kristinanamaste.eu/files/18443936237.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7tvg4kqti1bc4f101f92icpul/fapuramitokigofu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mg1d02o0lkqi8b1oq82vikiu4q/sovasogubewoxebejatiso.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/dukaridorosegixoxilamaxo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/17f0bf0080f3552eb0fbe04f8010ee83/42792042295.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/80714457429.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/97194092684.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb400abc58e33be264081cbc0b3688e4/78107287521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=india+speed+post+tracking+apiPDF 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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 10688 bytes
SHA-256: a02e9bb7a3eaea3bef21460ef3af6d81b97618619fbb0ed899bbe67ecde7b74b
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 17256 bytes
SHA-256: f5f8cdb729666a95486e8f9d4a8e5d68e12efcc5e29232a21dcecb3f212356cb
font_02_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1