Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9206b1086e9892…

MALICIOUS

PDF

69.2 KB Created: 2021-06-21 02:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1316fa4ec9ae91e4cabc649c109fcbb5 SHA-1: 5c1672cb94a730e97106c5171810433b013a77f4 SHA-256: 4c9206b1086e98928406dc270d156179a0c685ea69425d9bc7503da4146b48b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The embedded links are designed to exploit users by leading them to potentially harmful content or further malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=rosario+de+la+rosa+mistica
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607825393706a---lufuzonuduxomav.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7415e4423f---labida.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/29277782c63fad329ad0132fa02c0731/31146265801.pdf
    • http://bearings-home.com/userfiles/file/gijepawumekikosafusi.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2245d83a---55240110282.pdf
    • http://ceomit.com/fckupload/file/pikutojoxofexokimuwatoj.pdf
    • http://kulturazebrak.cz/userfiles/gudibiwu.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6rv2k1h7qfhuubv559u33edkvq/wekadazabewizajexajuxovov.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dajk3hbm4k0o9937llk2sul51g/95633092977.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57b971535f---44884025832.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bf7804cc---kidotiwiporobovojedod.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa20972363---58165718051.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/77bc3983e9a1bdfe31a0a742df183f6e/bibipi.pdf
    • https://arvikabc.com/images/uploadedimages/file/96164051760.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ce35ef7dc3e---saluvoweves.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887cb080849---65215270960.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ee59beedfbfb33a98bfb154afe9705de/90143977853.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/66099770548.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f389fe7ac71ef5d7966a8f1c01cee9fd/65591916435.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfde.bin
3c93d13eda44ef9368fe23ae5667c16c866ada93cb674e8b1286861d43a424ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 5092 bytes
font_01_sfnt_off0000e11a.bin
b798fede04047cf1042104fed56a86b0bdb900c0c3e6a6d67b410294e24c0c5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 11460 bytes