Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7ec123addb696e…

MALICIOUS

PDF

79.4 KB Created: 2021-08-06 19:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0b72807a85381c1d74cf2e32b449509 SHA-1: 777f165a827b931ca2156db288ac18e40e8d3b73 SHA-256: 7e7ec123addb696e2d7679b2b68775e63b11ec78ba851980e80160a045ee9132
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external, potentially malicious, content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xecuoihuyhoang.com/uploads/userfiles/file/darexop.pdf In PDF document text
    • http://shinex-auto.com/userfiles/file/zoletilozevakuzajex.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/jasunorogusotoja.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1e5fca79f0c893c986580ef7a61e47b7/82897048662.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/19751558185.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/bedotipibujelozulolanepe.pdfIn PDF document text
    • http://houselandia.ru/files/24245480041.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/17871171965.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///56988112996.pdfIn PDF document text
    • http://foodchemsino.com/d/files/siwez.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16221100502802.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50976087848.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16103d64932de4---37222187001.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c643bf139b3---vesopejizor.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/62944543256.pdfIn PDF document text
    • http://kbchina.de/upload/gurakorepudomere.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081da9671c1c---73368783750.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sefifixetezudifukor.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/jqnvlnbnossjhilphuh90cb2f9/27866990860.pdfIn PDF document text
    • http://agama-rc.com/upload/files/toximojolunota.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0e669de8d56e5a9574354a16c11e7b2d/45430906359.pdfIn PDF document text
    • https://vestol.bg/files/file/58937124330.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=future+continuous+tense+exercises+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_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 17052 bytes
SHA-256: 487e6ebe050a37d112b2b7e044f54e40c9e04e5c400f47a217865e14f4dec477
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 10584 bytes
SHA-256: a575c9285e6dce800076b8da0f056a4ebf94c97b167a7a9cf8f6258d63dbf80c
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1