Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8d0fbb64bf78c6…

MALICIOUS

PDF

60.9 KB Created: 2021-06-08 00:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb96cc54ac4a6ba562cc444a7fff60e3 SHA-1: f1d17a69f009b5e0f024df55a7e723d7e91d6048 SHA-256: 4e8d0fbb64bf78c610291a72618d6a9d0f86220cdc78895a94bdd3a796b43b72
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.8124

Heuristics 4

  • 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://queure.ru/uplcv?utm_term=conceptos+de+mol+soluciones+y+reacciones PDF link annotation
    • https://motelandratecuci.ro/userfiles/file/86101720932.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/sabugonami.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/48514429470.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8mpc8hvustd6hspbmviu3kgjn7/vinekezopibovazipuxituna.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/52b59f3eb2d4a4c523906d6fb0f3b3d8/lusorim.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f83eb6a8e---fupoveroberizulonez.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/4597134634.pdfIn PDF document text
    • https://room12shio4.com/contents//files/15801318741.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608719e62bfad---71459292367.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609adee349f02---gezojizumenoka.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f087894d1ae0509e7d92ab56aa6c2539/lewoloxebexizumofizukedoz.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/86198590755.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160926ab5f28c3---tufinafejekamafur.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89229a6fa---mobapibafoteteb.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f632c1923---75406904680.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 5228 bytes
SHA-256: dad8c4062d464dcdb2ef9fe61536f41e4176f024b6b3415f6901ee39f580c525

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