Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde097d2aee83a75…

MALICIOUS

PDF

80.0 KB Created: 2021-07-09 19:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62a9bccb6ee84ab422764e96fa8ac4cc SHA-1: df900862e912573ee594e5be9aad8abeb8320d69 SHA-256: cde097d2aee83a751c59f05fea3edf70e34ec6bcc46f0284adc70a450cc0ffb8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to manipulate search engine results for malicious purposes. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6789

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 http://bmcnx.com/userfiles/file/31243421896.pdf In PDF document text
    • http://ehomeforeclosure.org/images/file/46474673998.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81a60928f45b7714856582c66940450/40119451264.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607742ae49961---nezibikaxofigugure.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcc4de5cc6---lodinugo.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/5890688592.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/legasigofomuwuzog.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072519069beb---lejiva.pdfIn PDF document text
    • https://pmms-online.com/assets/file/29256131380.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/fcdff6e549f89e97e713f17454dd4eb8/nidadagobetanabegefikita.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qqjh0rohggf4au2s6tlgl3hikd/rubevujinugidimimobakowo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ca438e3---tuzibepifugunifiwuxadega.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/37276516260e821844428e.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b602c57a---serumonikewodegivegiz.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fotika.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3857e1e57934b8ccdfec05c3c25f2275/bewutoruwuwasovisigedup.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d918605ce3---sofevomoverelarotakura.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/jugiremigax.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4aa8a439ea146567d4dc6c1e61b8ff31/pezinemebusilupovirikinom.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609baafe70e80---86076297365.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac39debe5---76864735667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=houses+for+sale+in+wilsall+mtPDF 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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 17948 bytes
SHA-256: c69de57d3ced4447706ea275f16c542984450be6fb0eb2a880a31062af353dbe
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 10552 bytes
SHA-256: 0891cc52e53cbe8bddff9807d0dc87979e2e00833b1608b7962710b84ba4f45b
font_02_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1