Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae03ec2e53bf7457…

MALICIOUS

PDF

104.1 KB Created: 2021-07-29 14:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff1ad6a2b86f1785e1d2469e632cb044 SHA-1: b98c2c616178b2d637336273d280accd1776a47b SHA-256: ae03ec2e53bf74572a9cc95144603fce8d4a7e297855636d19cda401f037ae4f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/aqqjuc15frq788kuso8cfm53uc/50002958514.pdf In PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/2698248764.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609046321211b---15565935817.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/vezasamoxo.pdfIn PDF document text
    • http://sport-way.ru/img/file/92066122000.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0e79caee8f1c102b6c312a7b4250b191/dixixevidip.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/92695575531.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6o0c8583cd1jk35rdero3emt7l/26489677918.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/57667085564.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c36e28458---mixavarod.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/48146942085.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/wovifegigadiwabapuworu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/guregarufemix.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/50290391983.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/jepabatojuno.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed73d322---zopuga.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/lafoxutovusubatobapoz.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/579d8b99164692e75b65f809f1b4c685/vikike.pdfIn PDF document text
    • http://centromp.it/userfiles/files/naxupaxifikorizuponob.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765865930bb---lafejalezegosivu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77bce818e4---14944385751.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/50897283197.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/554597704ae1fef0878756701b2d751c/kejezuw.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/8361483196.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/vasevujinivafetunerekoli.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0095d00a---69145903184.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-29/20210629092533151697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+happens+during+the+storming+stagePDF 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_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC2 10884 bytes
SHA-256: 7cba2977d59000bd318192c11f0169e286cbadab808ae02656feb5410d35208b
font_02_sfnt_off00016389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16389 17996 bytes
SHA-256: f2ba2d9560bb68abe91adb09836930d9ab9be7dbfbd3a41e2b0725b2812cbb5e

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