Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5ff753fe7bcec4…

MALICIOUS

PDF

68.0 KB Created: 2021-06-08 13:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 24fbb4a1091f1ee582d22be5a12da53c SHA-1: d3fb763b91644aeaed4b8d7decb19852b2dfebb0 SHA-256: 0b5ff753fe7bcec4e94358cd306c93fa50102a2032d0e6dc155bb0bff36f1152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=why+did+juvenile+delinquency+rise+in+the+1950s PDF link annotation
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c7dc180e67b40181a5933e63e9172d9c/52349258017.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/78692741908.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/nuloxademoxodetozoramu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t351974lp7hv0i1ltsqfuvv58u/8463411250.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2e8f7ce23755d378531f12ccf9604ff8/pobilovezobebivitobu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961addaf4f6---34809285120.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/823b6c730018093fd8e37e63d0071de1/zobubimopizeretep.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afca0429e9d---29470219323.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/psvm797qnbvhm7pv95g4la2bo2/likuxafitiwanegefoj.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad6ecac5e---52316137973.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39d15ab2b---vojuxetibapejinuvilon.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0b638474.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/trkji8dibb76fjuq2bjedonkor/mupomupogalijidir.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4510e5afb---bokizagerep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 5668 bytes
SHA-256: 6da2ed786cc326ca3c6b3e7485e93021a512d9974f0642f9adb1b2d92f68d904
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 10304 bytes
SHA-256: 68f2d04e6a3fd75dae78ef7884f2ac6fcaf04cc2d3a19962afde4cb9023a0b45

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