Malicious PDF — malware analysis report

Static analysis result for SHA-256 f519566436501d83…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 02:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d21c5c07a6c4eb8a4972f28205e68e2 SHA-1: 088cca6eca93caa36bd34fc9ff5c48b9e1034d23 SHA-256: f519566436501d83152b2eb56023e451b4ac114dcb2d86b8c6bf0f11964aece4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://teamcode.net/upload/files/sefajarinukagitemisuj.pdf In PDF document text
    • http://orderkai.com/uploads/files/zosowoxumusevog.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9d05eade7ce48a9b00d3040277205f3f/28778056517.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/55b644b56c0e00f57081daacdfa2cd75/62919459853.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/9894347708.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ca942671f---82864819979.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/36970988137.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/worexomimajuzetoxinupis.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/15da6eafbe7d1b364fcf840d050c62e0/54859489582.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83905ecf6e---midobal.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qaocsr2nfqsabcauujupgelhcm/ripopuxalapiludawugab.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/22214786812.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65b5b4c68---95551256867.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/31487903587.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b38f1dc9a9f552cd4bffa48e81f1a518/filot.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/48841013364.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ffaf4067fb0413b0c8bfee907e403e84/kenitulumaroduxorofemesa.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fusijufakitizezi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ee081003---11546882660.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/zubesiso.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mijizovesowujegerinowug.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/78385860189.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160896810557fc---togopujete.pdfIn PDF document text
    • https://incense888.com/uploads/files/202108210447173886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=canzoniere+umberto+saba+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_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 20356 bytes
SHA-256: 1490879646ed3a2fb2dc6db4cf88e0526f965a2d84d1111ad639fb171e00f720
font_02_sfnt_off00013101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 10944 bytes
SHA-256: 2bd7d023894dba42677022f105e7eadede887cbea6fc683e5f82dec799c228dc

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