Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dffafe0888693a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 19:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63d60e063554d734c172403d3018e4aa SHA-1: dce0a752e6d71573fa4bb1793d2beb78f8423172 SHA-256: b6dffafe0888693a9d73711278a44bb6c40301ffd9935351633fd4d0463e8842
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many of which point to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/bipabovirixik.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/5370052150.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/runez.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/xarezudovenogameze.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wuzukesejidukusufokajez.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lqg7jbv79ue8vhgaerslu2isp0/mazixup.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/pewotematizetatukuxamim.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/minunezuwusowumosevufe.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fadupibezakexevurapana.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qep5f6u4jimo7hq5cj5ibjhuis/juzenewiserevote.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/47990812253.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/63099240158.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/19430950582.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/50398187800.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/65882722750.pdfIn PDF document text
    • http://kes.org/upload/editor/files/kogefadamatesolozup.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kafamibalonuboxuweben.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c899e3ae0---puretigeg.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/bawojosusuzebo.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/kikuvefuredelolakugevob.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/23391357794.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312d8978ce0---peninipoma.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697da66512---22943460001.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/nipodopaviwed.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/44208751898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wavepad+sound+editor+pro+apkPDF 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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 10592 bytes
SHA-256: 0ada6ae8f3f1a94eb398ff1c53fb796a5a4dc4d53b32838e598f548e0065a7d8
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 17216 bytes
SHA-256: 46fb22867eb07bf6bade3fa23fceffcfdf4759282bab3a21957d01a466ee457e
font_02_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.