Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83b1eb6faeb9103…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 16:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baad1f8d26661a3a559fe259792ddb6a SHA-1: 52df9016ac93d6eb7e7067fcc53094d85b066fd6 SHA-256: a83b1eb6faeb91033a3e049830d71b0af978a8d81248687175f94807188790e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to WordPress sites utilizing the 'formcraft' plugin for file uploads, suggesting a link farm designed to distribute malicious files. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and the nature of the URLs indicate a coordinated effort to host and distribute potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab423b7b7ca---91390584902.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc895c5f200---zufunixinuboferaro.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/lugofiminezivorepezijawif.pdfIn PDF document text
    • http://asfalon.com/__files/file/99878051771.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/40844954416.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0817fedf---dosawoliw.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/29225002856.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc5bbf676---desilivesazubirumaw.pdfIn PDF document text
    • http://nemalipics.com/85328921047.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1e9dd1b8b4ba3db418b4075f6855f09a/41242788371.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/rq4itg8j8n7jpq1i9bp8f63us7/88428011561.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b05d8599b6c88e2e4715f65da16a34cc/82356827137.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/vesabija.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a743cdf63---22227653424.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210817075311_1990448927.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/41483226884.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/12687901719.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fe56cfbbf---fikorup.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/66645930773.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2d2382ae---vemekoxor.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/23084397604.pdfIn PDF document text
    • http://proxima-design.cz/files/file/dedavetotuwes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=english+guide+for+2nd+pucPDF 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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 10844 bytes
SHA-256: 3f3e8a4159140e36c56c63637284970ccd11ca921ed2db7655466ddb049f9a05
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 18536 bytes
SHA-256: c76233da4072c384e30ce0fd737a14371f46cdeed0efce699243d2958a02b03b
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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