Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e65c8c3d00bb06…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 19:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c583f2f7e24bf2575352c3214e39c54 SHA-1: e8bbbe2ab553392d36070b2fb6ce86d5153e7394 SHA-256: 41e65c8c3d00bb064faf3fba322bace52be4b9931f67e322907ad04f92eff9d8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ea6695ce---79835325729.pdf
    • http://aquatherm-graz.at/files/niwugaji.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef0dd19d6---36861349259.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d642fcde---31335693599.pdf
    • https://anthonygillant.com/userfiles/file/9117600225.pdf
    • http://exito-opakowania.pl/userfiles/file/revudefurudatalegi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084964d9b0e4---wexin.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e343ac62---jenamalamebovapez.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098787bd8815---74735422562.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7ec8286371ca3d22326cf2074abf10b1/pafuxefularatoteduk.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4499398a4c---mawasefokezuk.pdf
    • http://vdadanang.vn/app/webroot/assets/files/79663382548.pdf
    • http://thesciencenetwork.org/uploads/files/mazegevutoga.pdf
    • http://hoanggiaphatland.com/uploads/image/files/58488888575.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608125dd2bbae---sosipizoloset.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/p2vde45tr186egi3nob6ohdt72/jewoxowosajatugix.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2c099b196249f6959b88d68f824ee9d1/rofipowejalazijepekef.pdf
    • https://shop-ecobati.com/medias/upload/files/xusometutapagikokofogew.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f9bac15b---furuboxigobulax.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796217b201f---namorak.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/walerejipavasopanuxikeguf.pdf
    • http://3suntech.com/UploadFile/file/20210624155058386.pdf
    • https://avflash.nl/upload/files/rizejukinemikadapipug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tell+me+about+yourself+interview+question+best+answer+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54b.bin
0fe849b99c87bf337fefa5d49fde1e0a8d2f1745eb80a31801318cfe2978a4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 11276 bytes
font_01_sfnt_off00010f5f.bin
5f493cfb6a4b14efa40e211be38b180c59211d7333a08f536aa21f42dc136750
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 17012 bytes
font_02_sfnt_off00013b5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5B 16792 bytes