Malicious PDF — malware analysis report

Static analysis result for SHA-256 e599fb08dde31509…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 01:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1b7a6f0e4cc95fd4ec28b96bbc2b595 SHA-1: 542303ddc314783ad5c8232faa233d68c7419269 SHA-256: e599fb08dde31509bcda720a2e87245101456c0e0df9a6e60859302bdd01c25b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://crewmak.ru/uplcv?utm_term=time+management+worksheets+mental+health PDF link annotation
    • http://wami.cc/data/files/vupuxukilux.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c853aa4c13662548958fdb3d10485f9f/mukerilukumorej.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/11763467594.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1046fe26fa---vaguduxonep.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f66159509737363464850448c07d695b/84164892175.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd0151721---5439177882.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/fopuguso.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088503cd8435---85207497635.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/wasoja.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fhglolu2rjg5gu91fhmpkv7mvp/79511313851.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/537d157ef3d3bda233c02bff42499970/bemiwi.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/87992424026.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/93649121937.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8d7076a65a0d9d8868991764341e93ba/guvibewewepazaw.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/49512512082.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609100d8324b4---86701848127.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3f7370389d4ccb9d51244ac31e572a67/23560727182.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/renofobutiwenolevu.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/kudefuvewunifaxepakupezo.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xifokuniwolederobuvij.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/dubifabetojovisu.pdfIn PDF document text
    • http://ombs.ru/uploads/files/duwibijeluxubokoga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 10696 bytes
SHA-256: fcc5821917b9fc594f2cfa14097855e36b32f56e4bea727b37d7206d2aa91b32
font_01_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 17864 bytes
SHA-256: 2f1e622a9275815963c9fdf56baaa3e32860a542a530489b73c5586bb6fb3177
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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