Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc60b724043e75…

MALICIOUS

PDF

70.7 KB Created: 2021-06-22 19:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 25692e870e98a3b19c90bc91d526f463 SHA-1: d72cd7147da8b5fef3b47ef6a360ee917886e019 SHA-256: 4dcc60b724043e755924a025ab7f909927d0ae3a5e0017d2575c5a96980a88e9
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to host phishing content or distribute further malware. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8132

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=merge+dragons+unlimited+gems+apk PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b39200b6042---tasuximulotugutos.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6e1e45ca---28110960156.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/236013b358221065162005f44be2ca53/15190226776.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/75730b163dbc05380830be04fa9aa88c/76884249553.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b155af6cf4e---megevazujoko.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b221729f7---mazobanobofis.pdfIn PDF document text
    • http://cycling-software.com/files/file/xitivuvelipaleni.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/fudomulup.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/92714947441.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608372590aaf6---genebugenekaguvu.pdfIn PDF document text
    • http://ekotronic.eu/files/file/88976631060.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/35881080513.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9ep913g1dvgkj27cu56cfh2j23/badeloxafogajijamalosor.pdfIn PDF document text
    • https://agatanorek.com/files/file/nutadupuxidisixam.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0ba981388bc4c64a7435180f78868346/kogepul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 5348 bytes
SHA-256: df2a02eeeef0e76c9ff05e9ddae69b6103b2f942136b0177ba51c583e8ec3a1e
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 11536 bytes
SHA-256: cf62f5f4e10c47c8cfdf3a6736aa4dfee886e7fe7626fa66b0e61e8a3c35d558

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