Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d4c46cbdc518ed…

MALICIOUS

PDF

100.0 KB Created: 2021-09-05 09:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 507b50d3499d1cfa0b6c48e72202813c SHA-1: 3f1ad61866db20d8aa4051f072f810dcea3092db SHA-256: 25d4c46cbdc518edec6486be81632ca0c766454f36154b046fcd1f4bf863e15d
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The presence of external URIs and link farm heuristics strongly suggests the intent is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://acrclubinversores.com/files/galeria/files/delika.pdf In PDF document text
    • http://siembra.me/uploads/files/lofesotimewiwekezako.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c93ec0e4e---zazaganepug.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/fudezekusal.pdfIn PDF document text
    • http://juha.be/_files/file/90630685663.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092745e8d221---21685936424.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/bukatelarimumebuzuvotu.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/62064755498.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/78436214517.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/xameri.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/gajosotagidubuxaruviju.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcbc5d270fb357d73984037cd9a3d58a/jojagi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dikoji.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bdbdf0308d4901cd700793e7875bb7b8/gujimobigulenaka.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/6945181933.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ev55fsi5id8eur3bppdtiaklg0/77548565309.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/lijufuf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4i4g0qsd6l67n65neajklke3gt/rirupez.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/61088421450.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109050756293710.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/56006882747.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff07a4dac---4990091632.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/69697901717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=white-rodgers+1e78-151+programmable+thermostat+manualPDF 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_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 23448 bytes
SHA-256: 0dc280d35dc878dbf40f7cda532704d5bdbaafc5e4acdc3ef2c021c3969d20fc
font_02_sfnt_off0001670d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670D 11552 bytes
SHA-256: 3940c64588702a9b6b0f9f3d1b3bc1d5ae8cbd09290a13a7d0b85c45d2c71af2

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