Malicious PDF — malware analysis report

Static analysis result for SHA-256 025c409bdb238165…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 02:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b9f9adc9b4373dce98d9637dd49a863 SHA-1: 1b9b3f3b6587470059f680dc20af6071c32c95b1 SHA-256: 025c409bdb238165fc83529df411a226ba51b35aad97ea3d049b311987670450
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://ros.by/ckfinder/userfiles/files/gaxonawutujirezig.pdf In PDF document text
    • http://bualuang101.com/backoffice/upload/files/lulosabajaju.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/firevejuzulipago.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/nixetabuzepilewo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hktb9asqu8kkq0qq6vnnmsuhi2/jegewomamupebuke.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/sowelonipaxa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4vhhg0eg92qf4aktmb8k66k3u4/lukudesixon.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/feroluwakuputi.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/14261883339.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/79630871814.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/882910973.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613595e28bb4e---50417676566.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210906_EE9CD8D90233D6D4.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/13260800093.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4a63d5818850957b754bbd05bbfcaed7/xufogivijegod.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019de1715a---64341630193.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/loripufugikimabasupori.pdfIn PDF document text
    • http://cbstav.cz/file/54860265651.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/896655810.pdfIn PDF document text
    • http://polipack.ru/content/file/64035725146.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/bugopag.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/dadulusafake.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/31999708504.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/zepitijobotebizo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ad1df08f---28351736412.pdfIn PDF document text
    • http://efckrakow.pl/userfiles/file/zadobetepopufu.pdfIn PDF document text
    • http://origo.ws/userfiles/file/rivaveguxurevos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+shadow+fight+2+special+edition+mod+max+levelPDF 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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 11344 bytes
SHA-256: ccc6b1afcfe651c04ea2b5ed9d0cf38141f6d17632aa50b383a2b20882ea46fc
font_01_sfnt_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 15096 bytes
SHA-256: c5215ef8df4c110bf7bf3cc31b47e83586af32be0930301d266a69474c020950
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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