Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eb14c5a80822e4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 02:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35865c417f6f9eda05537588fe7ac5f2 SHA-1: 6cb22654ce4e78186a83b3c8438a5ad0c9e6db70 SHA-256: b0eb14c5a80822e4d657d2ffadc6ef491d47f7065be44e00f25ae6c4b29deb21
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no specific malware family is identifiable, the techniques suggest an attempt to direct users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.auto-ecole-acm.com/ckfinder/userfiles/files/wovonebenemunegonafar.pdf In PDF document text
    • http://ccadl.com/files/20210906193809.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/wuburisuzaj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613751b4d1871---81178461368.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091106365866.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/39895354278.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/muzemukogedutisuvukozino.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/73271687967.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/wekupiduzejigopuwutadex.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/79269974943.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sogewasozokegexaxenifafuf.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/zunesazuxibesolokodowi.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/9933611585.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/77368846237.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/melalase.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/47790205154.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/lumawaxodiwaxogumiwilula.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/vojunugojol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130269215a62---vigosawupuvep.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/54006295586.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/58939572118.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zorok.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vojanunaxametujamabesopo.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/77951841011.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/75750520916.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/dukij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fantasy+font+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 16148 bytes
SHA-256: 50a7a64476bde0c81c36319c21c06e912a13ca378a06140d12223bf497f1f16e
font_01_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10164 bytes
SHA-256: dff7d0422bc733ab10e4f4bfb7192bfc6925b808b8cb08096febf11661412e07
font_02_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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