Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bba3ef2de0c3b9…

MALICIOUS

PDF

66.4 KB Created: 2021-09-23 00:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 462579fbc694bb1fbc46148d8fa59f5b SHA-1: cbaff8cd8398fdbce29e6a3ee65a8a524e226b5f SHA-256: 08bba3ef2de0c3b9cb6cc3217cc1831bd5ccba77467c85f8412cef766881f6ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8010

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416ab03e8b3---kunomefaliwowomekufevi.pdf In PDF document text
    • http://idevoz.rs/files/dinakuxixakanedewezi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bc29daad---22019719397.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tiranuwojizaxir.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/munexu.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/gigokavoxegubefex.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ludude.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bafe9ef21ae845c3d71b300db6f85f34/sufun.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d503f1c8bea816d14b145d6056084b37/36656267237.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gigukapowabewonazi.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/60135538639.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/99729610451.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497f64c1f78---49476394537.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/xatumeturokijok.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/mevawege.pdfIn PDF document text
    • http://ewtch.com/upload/files/rikowatonarimaxa.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/86159106924.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148f71915f94---sububinofazelu.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/49826627375.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/13335721384.pdfIn PDF document text
    • http://gr-chem.com/upload/files/zegituzajoxipexixemab.pdfIn PDF document text
    • http://bienbao.org/uploads/files/97029756434.pdfIn PDF document text
    • http://chemsdano.com/upload/files/vetemoxilimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=words+their+way+syllables+and+affixes+word+sorts+pdfPDF link annotation
    • 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_off0000b2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 11032 bytes
SHA-256: 6e4029941d023fc46eaccbd4cf6ab8f1fbf989e92d682eb682d3f506d0513f9f
font_01_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 14332 bytes
SHA-256: f4c2601fdb742d249d4f212b8803d8810e91e826bb6f1706d5ab8257b1610b90