Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b1e39e8f9ded74…

MALICIOUS

PDF

81.6 KB Created: 2021-06-13 07:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19458daacda9854af7b4840408d9b590 SHA-1: c049fa7acf33f634ae1ecedbe9c56bb631272c47 SHA-256: 89b1e39e8f9ded7443dfea8e89d3b5e5ef4df598b9d73ff6af7701f295c4d1d8
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 0.9285

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://pistant.ru/uplcv?utm_term=cleo+gold+apk+no+root+download PDF link annotation
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/69e6d3dbb4676b52a338f1a45c86d00f/zojuboxunujuxiti.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078d73b55055---70659981252.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/18891646998.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/28853439906.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/26607685100.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t7lod5na0jin19g01r4gncgfj1/livuzusazizazabulesetikam.pdfIn PDF document text
    • http://apvn.info/userfiles/file/48061183543.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/14960715207.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce67411e80---84688907064.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cd04bad01f92cd00ef72ca78297af384/15674638674.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7bbeed388a04b319106dc7940f9a3f26/fizinixojuret.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5e618802---nijojujojar.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dngvr07ocr086t7882lmogj0j1/varofenojolizeme.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05aab4ae9---denavidezaxo.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210612_B110F998B23A9EF8.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bli094phd8dmj1ukden9fh04s9/gisorijas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000123ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x123EF 20012 bytes
SHA-256: 19f9dc3f10aa0573a8bda8bb1b86ee3b59e55fd3dca7193f978ec3563eae0be2
font_00_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5008 bytes
SHA-256: 89e8fcba500bb73bed5bc7154ea1a5a8e8386346e2dc3b432948943075fe1d10
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 13652 bytes
SHA-256: bf033b78b85acf85ed25d1d0ad750617c600eff16bd9fdefc0a3fe1a040880d9

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