Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05abb36a6f9de16…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 19:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10a0e6fc164e47ac6dca391006ece5e1 SHA-1: e62aea7033d388b6dfe263c04e15b7aa8d1b43c7 SHA-256: f05abb36a6f9de160e5112b324345585bdf22d11ae21c192e3c693b8922151c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6659

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://crysiq.ru/uplcv?utm_term=bhagavad+gita+online+pdf+download PDF link annotation
    • https://radmangroup-ye.com/rgfiles/file/lerodaxudapukonoresu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/47970536929.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/89187353580.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62b5a3a43---39627633959.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/tirunif.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/u6g5fcptnjjl8451u9oc1dbneu/65520560372.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/66567903099.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ddb9532b752c02f812da0ecb1f5cf508/sufekulexitovulowazubekuk.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/rofinabozu.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/fajerikoxobesikorudiduf.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/vararelibipuneviti.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/55355226559.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/jemeselafi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160846e4147c49---jojamajaxewit.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nasexazorugekepekigekere.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/25175538625.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd491153742---42418401599.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/adf968d3fa015cb8469cad81b22a4909/doregapijazukamijifefujon.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/1287297868.pdfIn PDF document text
    • http://schturman.ru/files/files/somalatanevitixodogu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bg2p2ccfjvnv6q2qttr2v5vs0s/21998897634.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/56581240609.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0ec2af23---fipuxala.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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 18160 bytes
SHA-256: fb67b357ab5716d5cd97ede6682ccb92bd9b5fd8843824ac1384b1cee0b8c068
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10712 bytes
SHA-256: 8159cf9e7a664962ab9f6bc9f6b7b7d3de38abe665a348ffdc0926e0e1654645
font_02_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1