Malicious PDF — malware analysis report

Static analysis result for SHA-256 2684271a4d7f5061…

MALICIOUS

PDF

81.0 KB Created: 2021-08-23 15:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddc744b901dd4ce32e7dade22844ca6f SHA-1: 07bb20dd27ae100d54b4c159914ac31713e006e0 SHA-256: 2684271a4d7f5061d349f72b6088675b17fb58305f2242a97322d35d5326fead
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=butler+county+fire+and+ems+dispatch PDF link annotation
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/12611610257.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eee6fac0546c5746b1c19f7f29bc8442/vagojewuvuludoponerevu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kuvugirokonivaxufegafigu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/98875236605.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/murumatej.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/13033480992.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/92ebb3e82134f000067cff3a5393bfd9/notijawivakafabefimukitog.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23a9e269a---76813208897.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/37957744557.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6928c6b75---wedujifisekuxase.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/zukujusemubuwipaz.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/pobipoj.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb555cf799---wonowijewisozufuruvoreda.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/j1gd9snq0ikib2gh9cs4lhenmm/kukerazuluzebaxor.pdfIn PDF document text
    • http://lucann.com/Upload/file/dumasujefilisarobaxow.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/ninirazomifuzeku.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/79960247.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/kesored.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/gizonupegivumuwaletaz.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/46091218782.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/94165807185.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160857ca6d99bb---13476687318.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740319aabd5---tozatojotawuronubem.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/14369104428.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5642aa6d44---10375141799.pdfIn PDF document text
    • 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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 11152 bytes
SHA-256: 890b39122499cd183f1f9565e0a7b3401f2fb84970843f7cfba813235aa17dde
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16868 bytes
SHA-256: 03437ccd40b96a48299368ee89d748942091c3f70aea603ab5456d190770e350
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1