Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd78b6dd2fb8196c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 07:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4b325c14b0e65fae5e91e1f6f11b9b2 SHA-1: fb7a21b84a21abfe3327caeea6c63fb4c936224e SHA-256: dd78b6dd2fb8196c3e7fe507ba91d3de949cacac643224d837e83ff292be629d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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://sushigonewildtogo.com/uploads/files/5897212617.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/256ae85f6f77c84e252e5c6cced74db2/fulapawejiridifemuso.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/53552777860.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3c9e2383---pivezevuz.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/36832095310.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/48197865265.pdfIn PDF document text
    • https://aneri12.cz/res/file/fubowupowijudanufegikisas.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vixasudezujemaselinak.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f434965945---36552880866.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0e65aa63d776e7f85d3d0de8aef1160b/xexozowavekut.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/diwor.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/446c9df05eec77bad6b48929ceb113cb/85303725088.pdfIn PDF document text
    • https://csn-alliance.com/data/files/kopilewan.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad130930f95---sesunibazep.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8630c41e8d25b34a41b59a9878cb26c2/fetuxowidux.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ddf5f52a4d7641130a2f8a69a62b774d/62436511393.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6324812bf---butese.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1732a87c498ace0a83f8b88b2e69a82d/kepiwikewo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb72dc595d---8342990999.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/22675673577.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/josinotaj.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2b458c899b371f132a6079d560b41f90/gokapovixikiwagatitew.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pqrkaoqcm9dnib14cmrstab4rs/20943664811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=balancing+chemical+equations+worksheet+class+7PDF 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_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 18624 bytes
SHA-256: bdec81192e15200acb8386b3e296d641eac19862bd74618debad41e721ae108b
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 11204 bytes
SHA-256: 42b7dd9b6dae56539f70dce6703bbf294c847f8af1aaf72ef5f8addf68367433
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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