Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5d25fff72a772a…

MALICIOUS

PDF

65.4 KB Created: 2021-04-29 12:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30154039287dc3f5de3017d1b6d5a42 SHA-1: 2f819a302cf133c68672fbf1792758c99bb53b5d SHA-256: 1b5d25fff72a772a615cc6296482e5d19147aac5561335b8caacba851d32f1f3
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the PDF structure align with techniques used to lure users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 5

  • 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
  • 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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a97a08122bbb641c6aac735974684b5a/3674196978.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d8pb5it8nn03ocub80qm4fvub2/65713501734.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bkdv7t199f30rsp2dd90pq49nv/82871927225.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c65e3be5f---22344714519.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608899e6de9e3---7301235324.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ucbqokc612ldhtjeo862p76f67/77831793158.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/453dbab381e48b18f4c06fcde250e577/xafejasuvurep.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/0b73cfdaf36d5981bda2a3efd5190014/xepipemiximabakowu.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d585656f5c57e78ec63e5a68ce2a93c0/76789618673.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6af72a86d---28634534109.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/83q03q2vmr13glol8b6rj6l3cu/14330306605.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860060219eb---92450953791.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bc7c0268ea897efe9a1447aec290b5e/puvitopozexanotuwoxosiw.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f91f091c8---19283399711.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8472e6b68---8631013910.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1c8888dc6834d3f70820b0dfafb79a4e/tesolidikunad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lesson+learned+report+for+project
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f4.bin
f2398b635b085ef1e53c0a649e78389f7e862783a103d78831ed516cb5b0b45d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 4908 bytes

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