Malicious PDF — malware analysis report

Static analysis result for SHA-256 668558f235484ec8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 02:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9e182f5a80d57b3412e4585dfe82e4f SHA-1: 3eedddde217aaf0c46953e985a0a2698670ca888 SHA-256: 668558f235484ec8a1078d2959489935207943e22fb8eaccc6009b0bc7d06902
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to lure users to malicious content, potentially leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pijutofuwetunavi.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b2b256c9b0be214fd75dd214c84b86de/6947316516.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/nifafujapepazexo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210809124944221807.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/78812732914.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mekufarudedizuwasese.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a660459da8e---kazizivotujosobivorivobi.pdfIn PDF document text
    • http://teifsepahan.com/files/file/50427896160.pdfIn PDF document text
    • http://netflor.pl/upload/File/wikunanixewudu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/51990511727.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/48538c15bf9f5c67a496aa8741446fed/6111948791.pdfIn PDF document text
    • https://blugarden.eu/file/43454239855.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/kipuvemuxileb.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/geradetafowidiwuto.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1e6bd8484003ea65e336e04e83233f0e/lemukuwa.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/marovatajat.pdfIn PDF document text
    • http://demkapi.com/resimler/files/jivuvagu.pdfIn PDF document text
    • http://futboltotal.net/images/files/19319000414.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/pavuremudufoxa.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b2ebd3d8ea7655112b138ea748c4feec/96534141628.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca12c3a61---jatekokarunadotabefemomu.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/ziziterivufulosixavezek.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1ua4s3ocfqe1oahdgcua213ba3/zaxexazubogado.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/vipoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=concurrency+c%2B%2B+pdfPDF 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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 10292 bytes
SHA-256: 0d0dcc28854cdd97ba90ba1444431344da2ae0b26ebd86842bd3dce5c974717f
font_01_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 18732 bytes
SHA-256: 506c28841749fc4fb4742fab47a6eca242f7515d5c9bf6afac1aa065e81077ee

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