Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b98b9786cbdd6b2…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 12:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a79bd49a2f75a8106dc647975419d53 SHA-1: 27dd37f358d818da2605b3a42d5d464b6a5e5c80 SHA-256: 8b98b9786cbdd6b28a7b594dcc98ba58c7a85b88533088344863d4beaf441e41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://exima.kr/userData/board/file/31353483896.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aebcd563cf3---6950506714.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/46b70b65755e5d1768f049a64c847dc0/rubifejenutaseposes.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611782a529973---65628124643.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2c924a5e---57300201559.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/nodaxafiwitumabovebiduzu.pdfIn PDF document text
    • https://csodamalom.hu/files/files/nidofam.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d7f04055c3b3c6b8219c73d4ee6ce3cd/rajipozaxogivorigafijozal.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210826000752_2037244137.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099dabc37188---15749897592.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160f219a6b4cc8---vatenoditaxubefibava.pdfIn PDF document text
    • http://nakatka.com/files/file/24116082020.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/96950386999.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ihl5krpjode01j0h7eps2epuho/49346874283.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/53883919461.pdfIn PDF document text
    • http://thedreams.cz/files/kapilulifomovusopipalizo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e8bf48024f8d798f9a769c85cb2d950/94458368675.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/8279034723.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f4bea1fc1---41184647052.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/60051647527.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/vewidoja.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dafe07b2f---16796646137.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/77157574474.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/81054739618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=codeigniter+mpdf+libraryPDF 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_off0000b90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 17096 bytes
SHA-256: 1cf1d518a70e87928dc1f350f0a389f561185774f2b5e93af49f835904588040
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10960 bytes
SHA-256: f45c2b7f75e799aa1edbf4a603c381fb369b5e798f4216e918444519484714b5

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