Malicious PDF — malware analysis report

Static analysis result for SHA-256 337cd13a55a62d36…

MALICIOUS

PDF

85.3 KB Created: 2021-06-12 02:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d74cf6b8b3d353e7b355f2e6f3e95feb SHA-1: 725edfcac174cd3daea25d0d7582e5901a3e0c6f SHA-256: 337cd13a55a62d369d0477da9514e81d0e7ab7f8617d1c84d0ac09c0d7cbcf0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9026

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://irlanc.ru/uplcv?utm_term=download+film+pirates+2008 PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cedfb4b5088e03bbb21a03d5d7b227ca/pugemuruburabemulobaninut.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/omt2foj6gi8q5uubdkonn2bok1/65851554877.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/viminixi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2lbu2u3i8p4666nb5pcaa3cits/76502230555.pdfIn PDF document text
    • http://cecev.com/stockages/files/33332243393.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/jefelulemifatifewugojik.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/60218450422.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af28db53f63---9554460676.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/gomegeligujexuzobudune.pdfIn PDF document text
    • https://bataretak.com/img/files/file/25286537057.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768330d815---tamepujediw.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607200ede4431---37015302563.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/vetodekunokekelugid.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755f4c49523---lefozotikutufazomabetixux.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/refifeloxebibazowofid.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f139263c45efc98060327cef1f995e1/rogezewusegogefugu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9498aaf59---vosotamujegixivafuvopila.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
    • 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_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 5748 bytes
SHA-256: e83be285259a1392f30c5b4ac48615ff1365dbb01f0f43f86a443269b81794f0
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 12808 bytes
SHA-256: 557f3a12d896404a52abe3093f21b0cca164195912790260b1d5a9607a7a585d
font_02_sfnt_off00013c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 16796 bytes
SHA-256: 36e8f4b023f3b707e84dddd27aae72128c2a83b34bb979baf314e452bcdc170b

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