Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f01966e17cd7cb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 22:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 412939c63e61b3124d8f903cec1d2b9b SHA-1: 915e3f2e9289c489864f37b92e5b0fa4c9b0f684 SHA-256: b9f01966e17cd7cbfad91767a66edb73d354a506536421321483c0851c6a7351
164 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. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=how+to+see+who+viewed+your+tiktok PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334a4a98f97---36473551958.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131842b63a25---94787890831.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/mufabitaruripig.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/rademivowirujakitorekuge.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/80277710928.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/40229103039.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109110346569439.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mimimod.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dobowaxavisako.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/tekaz.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090111102140613.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3dcd6a09---40802091431.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/vesug.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/910828300.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/59904556559.pdfIn PDF document text
    • http://trubaopt.ru/content/file/pumufumanija.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/27211377421.pdfIn PDF document text
    • http://pb-book.com/user_file/file/balatu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374eee1fbca---bojijisulezonovilego.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138df68c392c---18451196367.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9a547ddc9d831454030e1fb91734fa99/keniraf.pdfIn 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://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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 17104 bytes
SHA-256: 9e5c84bfde7f2bffd5c36a43c4a1150935c1aeb51f799798e21f7e841f327783
font_02_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 10484 bytes
SHA-256: 76ead026be2711955c12243fe198ffea655383920012644763206552de5caec3

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