Malicious PDF — malware analysis report

Static analysis result for SHA-256 4663e5f4e9a92ffd…

MALICIOUS

PDF

65.1 KB Created: 2021-05-12 12:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2550961900a95b7d0c01710e426196b0 SHA-1: d6cc6d046e81fd85bf62eeac731d921da5d3bbfd SHA-256: 4663e5f4e9a92ffddb1112ceb9cd3a6fbf923db65eee30ad5bc39293d144b545
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm that directs users to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The document body, though obfuscated, appears to be a lure related to a "Hawaiian tropical fish guide". No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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
  • 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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n647flgcjjub45aqb3tcr377d4/lasobuzogunawofawajanom.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0e0c3e03fc25d895c238aa5260d2ba7e/56501165441.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1fc9380464be60b051b296cec7184195/13177361513.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/pn56ld4u9rcp943it2ut3pb4i2/35736197468.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160754611cb013---maragogu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/79840c70095fe7ba132ce2de2905f3ce/vemupako.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/31753995a016084868b4ef4f09346b6e/72840420759.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/06147e9abed9e6400a6e05743fd5b5c7/31927060769.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/72d63f54fb84cfd042b4291d1b503571/79107348140.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609687e174a07---38297650967.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/94613809754.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6eb9394231b6c7ade34995f3dd3dad34/zavipenijixofigonubikigi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/68f79d3e96395ca3dfb779c0300a7873/41586695889.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ba9e5ccaee2e621d2c86db8173cddc27/22378324563.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607332f2e76db---lozefutefizijumolaz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44a689154---71514161638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hawaiian+tropical+fish+guidePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 5468 bytes
SHA-256: f3c13214cb9fc85fa2c77a93285a9d7ac353a515def5680d2e3a7706ac49e4fb
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 10508 bytes
SHA-256: 6d0e9eb570abe53683ccb13756c338d9d986b002cac34acb1554acf205c8a4f3

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