Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecabad31ed523f60…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 01:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4076894be628224db5b0dcfbfe92ffca SHA-1: c5fb6c0506c1ebff64b7d873d0935659be428bcb SHA-256: ecabad31ed523f60e8c490246a856d859e520361cf24a6bfa67e848b778928e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6340

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://nitecoreromania.ro/files/file/80066312479.pdf In PDF document text
    • https://sanagustin.cl/files/xurix.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/gekaxutulog.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/84d1be12496508b48ebf7d8f0fdcbc52/59479618849.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/xapelixarawolunerive.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/vakajomuta.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///48591202079.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/vesikasuz.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/30702741488.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e549a99658---kefibumazejisuvazokaluka.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13344748223.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/mitipadodoziforo.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/suxiditogoketumu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5484ec69e7a053d4852c28a652b441b1/kewaru.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31946554208.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a26d50d61---wufudedonupamuku.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d44842eef07---vekoba.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/11f448bc073e3914e9d11391a60d51f7/77030070995.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ae1e7e2336b62d6f6f77ced27eb2339a/pudodolenaxozabitom.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/42269706495.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8bd28e04aa6ad8247a3ea8af7d37f885/57934618791.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7dea1dae7---32071175259.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xogupawaxum.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/73370057591.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d79c4c248---suramerapokazabakexov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rig+veda+sandhyavandanam+in+kannada+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_off0000bb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB30 10896 bytes
SHA-256: 2db267fcad925e52d1ebc4a9bcfffa9ce42cf28ff5f565ce59532989357a17d7
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 17096 bytes
SHA-256: ffdfa6d4821854855b255ae6534f03c9e9d8f2c36ab1d8f9e8be9b054a858877
font_02_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1