Malicious PDF — malware analysis report

Static analysis result for SHA-256 e311b8494f1a1e42…

MALICIOUS

PDF

77.7 KB Created: 2021-08-05 16:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57c5d28e7285ce9986bd051bcccb37e6 SHA-1: 9f6e0cd2d5324a660a2cabfc34589e8206e03051 SHA-256: e311b8494f1a1e42bf3920517d2c358c52a7d6674ba674cf0529c04959b8df30
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS uploads indicates an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=theory+of+relativity+script+pdf PDF link annotation
    • http://stolizstekla.ru/userfiles/file/14894108897.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/85b7697734e8f30e6a6f617cc95c0ebf/11850477121.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/5888704691.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/fofurobutefonolapiwal.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/zixeruzered.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/madokiniva.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/novuruniga.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/bivivudexe.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac173511067---67961656535.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/98a4bd67396a6f04b6bb271bb90a349f/vaverivitumuzunun.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/subulufesazoxud.pdfIn PDF document text
    • https://amblamy.ee/upload/file/23258816836.pdfIn PDF document text
    • https://serka.com/serka/upload/files/naledi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hkotirfho7jjdraa6064i05aq4/96299059458.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/78281278005.pdfIn PDF document text
    • http://grabnerestriche.at/9202329705.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/88766560659.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eeb4d587f---budipuwimadubimopote.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76b06822f---gakimuxemigovudij.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/90941886999.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/68476001647.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/53412140163.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd726d5d765---gunozika.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/zubime.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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 17824 bytes
SHA-256: eddc3bc7cfe1179294d9d8ff4e331b6d14ab4c1ae6d62b901a41e5cce372cc21
font_01_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 10756 bytes
SHA-256: 3c2c48bb1c54126f1e7c3a25b75a46760fc1b491753d63cdcf6a8b851c86b942
font_02_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1