Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f07062a2e4a250…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 23:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c08c00856a05cf98f7633409d8ecdb0 SHA-1: f0a954b2bef8d07840abc6fdd0420bd6cc4ae946 SHA-256: 85f07062a2e4a250148344a320854413e5cf87da5c66726192dd5e37a782fe3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple websites hosted on compromised CMS platforms, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://vizugy.hu/uploads/files/902956186.pdf In PDF document text
    • http://americandeliorder.com/uploads/files/73950252938.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/87e95e9142e2f678cc7f57883bbb8eee/65806153757.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/60235902466.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/78185719881.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368084b5d21---pekexabulemokin.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/54522256719.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/sudomisarimavo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/98a105a06df77bf8c7d6dc1309f3c67f/kuvusu.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/53271678038.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/31662414665.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/zolewikulojava.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lataweramapafemagevubeguj.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210902010408.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/20020175929.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/86227088668.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/76285007164.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/52758330112.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/44573225183.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132646550f79---75657045360.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/wituvex.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/97866700001.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/82328932715.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210909201414.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/19444908337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=easy+trails+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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 10080 bytes
SHA-256: 44d63ef87648166d4024ccbded4621f888fa0bba6501c3628784d6f5a7f90f24
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 17904 bytes
SHA-256: 9ae9a450461efac18afdce8f4986b3fa949e15831ad6ce847f5cf44ff7b587a6

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