Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd44fb4da79be675…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 17:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c40bcd1377054207eb2f78f619f21d9 SHA-1: 73d87cbc2087fb10010e4c1873564626c3e3cb5a SHA-256: fd44fb4da79be675ef57527c229f5680303c83f9b27369e4189b339dd64057a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs are a primary indicator of the attack pattern, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d286fcd8c55---sufeve.pdf In PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c5207a6a28606d0ec7c18daf1c0c116d/421502891.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9e6b388b---rolumobuka.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd2aeaf8a0---85848275016.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/baxeziv.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/grml03ac9qhvb2k93uql5cbq1b/zaxilikol.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/23972218925.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/jelefa.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/28535676434.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/vosixevesagusix.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/89317885804.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a8eeaf2b524fc4ae129d1deb0bf34a85/morimimarejepuvun.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/loxanufegunojogoxixaxiga.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bed409063fc---vozojapodulorurirubofe.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/avsf2db1ns3id4s745i9q4tdn6/96306582725.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c899abf1b8---78745675318.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9b1df210---xitamarepikiwosipalonutut.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/23394425330.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14be350cb---fafawavagita.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/78800184004.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/wasanadiwusileguvufit.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf985eb81---179895618.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/56460300726.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/71443537359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=customer+service+skills+for+success+7th+edition+pdfPDF 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_off0000b61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61B 16672 bytes
SHA-256: 3e1096032fb3ba234da0b0ba432492c59dce7e3c14d059d7ffe0d44e7357a150
font_01_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 11060 bytes
SHA-256: 89f347e52bbba9efade40a1fb217610eedf79a71701b64a29ab07d587fb04daa
font_02_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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