Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad847112cf83b0e…

MALICIOUS

PDF

92.2 KB Created: 2021-08-12 12:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16d090a8611a6914755b91ae699d1b50 SHA-1: 245318a6926897229a61bbf5e52a809ba85e5482 SHA-256: 9ad847112cf83b0e9b288b67f299d3d29aca9df04f9152f5b834a7efdbc253d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute or host malicious content. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9b18b6b9efac1474aef8ac77ad9ce1ea/mukexepok.pdf In PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/pemuzezekinefog.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c2b7069---bemufekudevosek.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/35840193258.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e634114840d---70275886346.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823474344f3---34423122549.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/22366787588.pdfIn PDF document text
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/490880127.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/betujowev.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/86043033190.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wibanositopifofokisemov.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074f81b2da1c---11914167349.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bca3ad1db9e---82785301522.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/72962298554.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/xunapigelivefelotuxijomak.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • http://turnyras.lt/Files/file/vanogurezedulutis.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/zixorax.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/lizujesuru.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/mkl96kg804hdstieik6u0p5683/lipuwurewarodedon.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1797b6e1d---titejonifasefofevevevavu.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gifodigikorepakoden.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/vuxoniw.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/aa32f96b285b696af4140b7dd72fc39a/pikojiwojojujukopu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kurifitajiririlesefagul.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79955d0fd5---81302286218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wwe+2k16+apk+%2B+obb+%28offline%29+android+game+downloadPDF 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_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 19700 bytes
SHA-256: 5f2f31b0b4d9065e67ea910c51e0840fc70fc95e1a4d7f93400dc71b890cd20d
font_01_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 11380 bytes
SHA-256: 9c3a995d83551d0c551bfca8529ab216052fc23db57094554c406b1156364c54
font_02_sfnt_off000147ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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