Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bc675ff15e0a14…

MALICIOUS

PDF

93.3 KB Created: 2021-08-15 10:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d16f904241ecab1ba5bf7ddaee025b7c SHA-1: 37886b94f72d462fd75c8870eb47072618421c25 SHA-256: 59bc675ff15e0a1491b91d308df6aae342589f7c26ed6b06d361e2c3fd50817f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to paste commands into a shell. This, combined with numerous links to compromised WordPress sites and disposable hosting, points to a phishing or malware distribution scheme. The PDF's structure and embedded links suggest it's part of a link farm designed to redirect users to malicious content or downloads.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4c786d3b---17822615064.pdf In PDF document text
    • http://v-lukomorie.com/uploader/files/91292246822.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sadivanadukojifavame.pdfIn PDF document text
    • http://jar-ted.pl/file/direwepogedovowam.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/13407184428.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/bepela.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/93816669895.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/92340352544.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8499e8839e324e895e15ec17aa3326fb/78674253155.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2f8267ef---37682881400.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861c252db69---lerofijojexogilekesi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/748d7c45d55e4fb2aac3bbecbd7c3a9d/52376869735.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o2b2784g11ofkiu7t607pjjuot/dopedalugisirupitemiseje.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c145c9689caac9f25cbea9b00191b0e4/fidijupapepefu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a9601044f02---76313989544.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/64a8363e7bd280e260d923d8de19349d/42594602184.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/8nqnv4nhh7h00h3mhhndbhv0s9/doresaderiselajafiw.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/rixuzivijaxelabatafigi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e3b8b62085a9d55c227f3ea6cb25008b/bememuvexamizovuworazo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e141726c2---gexekewilexebepamu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/senubigotapuxononalarador.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/amrgelgmkskdmm84bqtlg77e01/75796314019.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vplf6ku8f9mshmhia7uqj6citg/xaxitusexurobajogugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hands+on+machine+learning+with+scikit-learn+and+tensorflow+amazon+indiaPDF 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_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 18248 bytes
SHA-256: 77db16c859d6ad76214533fcd597a38d8d9d3f537cfb8b7a418a52d60971b3dd
font_01_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 11188 bytes
SHA-256: e0e67f0a606e6a79a31de6dad81d7b317dfe24331e41767fe9b85c244bcf76d9
font_02_sfnt_off00014bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1