Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45229dfc99584d4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 18:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff6a8783f11094f56eedea3fcb5fc989 SHA-1: b12f96a442223bc6c3785dcc27bc6b1b61e3e35c SHA-256: e45229dfc99584d4d1509aec9c40a2620c4ffbc76e8b8948c7af3d9bffe13db4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8196

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 https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/01hcs3gdt0ao9bes6ightv5n1i/75926474542.pdf In PDF document text
    • https://aradovan.com/userfiles/file/44275361711.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08eebc442---18125496405.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6sc0mobun2upg6n78952vpiaa4/bujerenijaxukitivep.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/81139349974.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8732d3b83---2352428322.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210618_532355F0416EEA35.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/murulimapigolutupadenax.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5522f018---3849094383.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/08tacammuq9sbpe252u3uhm217/22823304452.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/dapifenesogunikevupepu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/lotusujibagifopefadoj.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fa71b24d3ab2fc5ec1d63c4cdb894772/lejedewewubutejetab.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/dadb38dd9a4aa94454bf8a5d65edc9b1/36725764170.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ceea025ebfa13f3499c3306843e31243/78564894487.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/94e621e03d2ca76d091f784f4bbf4b53/titetuzanefexejogasuxas.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/rifajepik.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b510f5db2cd---53822386471.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/2848597138.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/kudigud.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/33809231004.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/27330066253.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108032333483614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rescale+pdf+to+a4PDF 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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 10440 bytes
SHA-256: db9f852b7e5dfdc7dc994ef16220f7f098c8a6069fdf15fa31af2dbfe40df620
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 18480 bytes
SHA-256: 83353de8a1ed3ba3c85118a7315f3e4445fea1d6517077f0add5e89c8d17bc20

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