Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47864ed580d7175…

MALICIOUS

PDF

63.5 KB Created: 2021-09-05 18:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a93f01409066ae0b299f41048459bfd SHA-1: 6c52c90305316e70d97da69ce7a3b1f34658b5ab SHA-256: f47864ed580d71759cc0ff2d23a4298fd79a34be5cc0516b58f1303faad75646
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 phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to use these sites for malicious purposes. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

Heuristics 5

  • 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
  • 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=pdf+reader+with+dictionary+linux PDF link annotation
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/v9tlrciel86o83oeqgh8gpb3jn/4549429336.pdfIn PDF document text
    • http://khocabien.com/uploads/files/nidezelurozejavebixeboj.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160806f0bbedf8---rubuvalefejufakiko.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/768eae9625fb0ed34fe4dbe75a6c8e01/gerusubekikadija.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/1495439000.pdfIn PDF document text
    • http://nenorm.com/files/files/88398997360.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56affa2993---70618063662.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/98453556070.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4ca57151e607bb5b8a4b3430ef56662d/2644406595.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gebated.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/5808736608.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/dopegitomesoba.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/75524095769.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/7951675964.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a76cced51ab0ce16e0e7ae720b71f9b4/gazedibesas.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/280753499.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/15244884776.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7b1e4636---69486030508.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b18909c2---vixakozekeveb.pdfIn PDF document text
    • http://stevis.cz/files/file/dosivekadakekesojeduvizit.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/rumunes.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/latajakuwiwid.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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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