Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cbd46cc1604f95…

MALICIOUS

PDF

82.1 KB Created: 2021-08-30 12:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7707dce41326186c61f9bf978309e517 SHA-1: ca3012a8be85ffe2c3b2230d85f72c110878de70 SHA-256: 84cbd46cc1604f9501f9c0fc0b173e272ea4be16c0f5c2b65be0d12ba97dd740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083896aeea37---fuluneniriwokexeti.pdf In PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vigowa.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/a8fd88ee3266802b11f988324b5b2a44/reraranafemezezu.pdfIn PDF document text
    • https://maisonforville.be/documents/file/funegaxelodumokerasozil.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadidupulefu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8c56247630547159bbf9cfb45077c45f/55921718021.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1a2c94763f7640054349fd6ac52d4c42/43520386572.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/nodunixariliwep.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jupegupazikadevevu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd9b40609a557ca3e2f61739908d3ec8/mokemanamevorikovuvemi.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/kifazaxekidetanuj.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1de8ec7d7e---tifefewokofetagafe.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/81987085227.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/65008824542.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/014748ee375286100149f992fa42a19d/87039151157.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/56702873509.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/nosidujinotizijux.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475f355cbf---16215695123.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/74079080200.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/15755826961.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af41a9d09d---80915441782.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102e053cefe9---kakuzuz.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/josinunowusad.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088246d9aadc---98215666358.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/59188936507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mp4+song+download+onlinePDF 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_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16788 bytes
SHA-256: 82442cb6e0b912312e8b117d1ec0a8d8d3f90027ecb25f4ef7b59d19ad1ecb8d
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 10524 bytes
SHA-256: 6834373b040f0549632b7aee1357c541cd95c0a765bc3d6bbefe8625d643aef0