Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7dd69fa317352c…

MALICIOUS

PDF

101.2 KB Created: 2021-08-20 00:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acc626fcc229187b4523cbf7a19b58ba SHA-1: a619f3d3825490b63e1d5232dedfd5f581f41991 SHA-256: cc7dd69fa317352cfe977f0830ba36760816dff04bcafa9290ab613858eed30a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9141

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=pruebas+bioqu%C3%ADmicas+para+la+identificaci%C3%B3n+de+bacterias+de+importancia+cl%C3%ADnica PDF link annotation
    • https://abofahed.com/userfiles/file/83536811731.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9jrqn75hctjft6l62pj1rgh3v0/pigogadofepotodegidawo.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bitiwetijowow.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/bamemimotuzevirijizag.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/16135807940.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e2a2b7501---68497010911.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074368b5444a---guwemivofuzesed.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/83983912326.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/623438276.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bdc18872581f512cb7e50b4430660a60/4396333091.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/nabenobugelun.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/81290957534.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608183d9073e8---fiwop.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9a4fef362---38643187442.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/selovisagema.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/javilifumukilovex.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2c475f36---75911421029.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/69090804694.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/69973240820.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb975b1e11b---82821394322.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/1937934076.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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