Malicious PDF — malware analysis report

Static analysis result for SHA-256 355e406e0d6334bd…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 12:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1831f53290c1091edc0ac7453d741ae4 SHA-1: 90dcf764039903040227cf2670add16a17a16470 SHA-256: 355e406e0d6334bd26de23cab3a5a0bd9d264b2f4d87a703db7b9f1646edbe83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6811

Heuristics 6

  • 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
  • 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 https://infrive.ru/uplcv?utm_term=libros+de+abraham+lincoln+pdf PDF link annotation
    • http://otoozevran.com/resimler/files/xuxojavumoxinutafusisurut.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16120a21ba7fbb---lobekepalixilebutofewufa.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/wafubixesine.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16076476716d06---73331419849.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00630572dd---vupasumotutefijujotar.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2b6719af---bimuwufata.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160879875ba261---kemomufuronokifanax.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c90f4a681c---tolokataxemumabewox.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c793cd4c00e---vozokaviligokoj.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8783454509---reremetubuzej.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefce2db2a8---44798717823.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/17369961171.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/fa28894f24b05c474691d6608241026c/mevovawodit.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/zewodivokelokumit.pdfIn PDF document text
    • http://wdnederland.nl/file/gemiwar.pdfIn PDF document text
    • http://xiao-bao.com/uploadfiles/fckeditor/20210902/file/16305817064453.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad546ab7b65c29e3d65b43ec6c62a28e/90106857364.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a21807e58---zudorepewutiwisinabawope.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/xugaximakazuzutuzi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtcrk7sfjq97p4lur51lqo86n2/15678434988.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/74223671853.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/bazalonapabetupux.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609473e5157cf---90660245382.pdfIn 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_off0000cc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC08 20604 bytes
SHA-256: e5e393ff9384d141d1054de11947dd44ca52e8f37651ac1ab732de608d61b8d4
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10884 bytes
SHA-256: de8adc8ff8caa6583d666a535c614a87721e4bcfa3f0eba4f78586722fb8008c
font_02_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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