Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1b794b0ab81fbb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 21:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b834e066923ff8d41089ae188680ba5d SHA-1: 934c8fd22be8adc68241633eac77d2bf8f52f62b SHA-256: 6b1b794b0ab81fbb88359e5502efeffd25c92984baa71a225721ff45f9173792
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV. 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 suspicious score 0.3616

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 http://hyundai-dongdo.vn/images/files/86035890724.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/021d76b5d08d6c0de1c4ab0391483f41/lokadebetuzuvuneb.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/visab.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56845f061f---5503341382.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c66916afe---sixasuzoludexun.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/vutedumidepibesibilowa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b75db9e97---sigabek.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/eea2a28e95cbab96d435f517920e7261/76325167886.pdfIn PDF document text
    • https://blugarden.eu/file/xavazewop.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bfe14cbb705f527b4e649d742c1b69ad/48254520975.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/xerejawulidafogogigosijef.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/falixupumeloluzefasagov.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/96418645678.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa4a243360---lefozubowujifitikewevas.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02c91886d---mafitoluv.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/sonazodozasonewadagilixo.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/fowibanezevedo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6ad394804b71f61dd930ff5cfcc6effc/tewodakakepes.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a9d206c4---jujavanevuvubazosisonel.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/zerabaripipe.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/jekovupeli.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/39852945801.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/67774397335.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6d5b9896---93862101002.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3ee9b788af437ce68233a2dde28f13d6/xamaduwawanapojuzemawamaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ias+8+pdf+bdoPDF 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_off0000bf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 16768 bytes
SHA-256: 2837e2b5473ad083ab7f21b1724f35ed8f73948e655c660fd70106e8bf297336
font_02_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 10216 bytes
SHA-256: eb609e47ef71c93ee59d4bc15f9bd1978675c3cfd59ed0c93c82ababb596f7f4

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