Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb816cb60c43070…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 13:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fafcf4f6f04cb7cb50314a3d1b506e1 SHA-1: 2a057f03f378a3db78bd0b99d400b1fe8d411049 SHA-256: 9eb816cb60c4307068f85f9aeda923c9dd13d39a7a5103bc691a62f055b5850a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=plano+arquitectonico+casa+habitacion+pdf PDF link annotation
    • http://sin-hua.org/userfiles/38788526399.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/fe3248ccefb3136cd59a3f11aeeccc4c/37020198538.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jadawifibo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/vipoxorozej.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/74660b844f27437adfea0a00726d9c69/73607492645.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tunudisodorew.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/siranomatofuteforotu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fd040aceb47---fuwazomos.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/82080403896.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6ki6egpj3eebqb3p7vh7nfie25/sawabajoxakorobiz.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/marumidobisew.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/59006492080.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6aa55a720---38482320046.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16072270c8e053---takezoneta.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/99610156385.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/35306195041.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/84024821245.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nolobivi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/29375493849.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/79788448598.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/def29c953b2fdf858c663c6a5ad62bda/mugigexoziko.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nf8js55tii72d7alcbe04qvv4i/bojipego.pdfIn PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/toziwewowadaka.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c427c88b1b---linawojape.pdfIn PDF document text
    • 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_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 11104 bytes
SHA-256: c3870b4f904d2bff93f08887d09825379901629d33ebfd6514b726151872aceb
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 18796 bytes
SHA-256: 0412c05a913ee666fb210a3628de2c70b3b4922771fccbca1d9d35aed873f0db

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