Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efb7e7fafe27220…

MALICIOUS

PDF

74.9 KB Created: 2021-06-26 19:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afff7e994df9d2490fb966847328ac9d SHA-1: 27f2915eb717e0026261f5de4e307b76c06849d0 SHA-256: 1efb7e7fafe27220a8596f718fd8a192a8bf2c9780d2e952f13a57e32d2670d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to funnel users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/760uu1b5fhf8cgmlh0m4aitugf/gisurom.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0551c8e696---19906688102.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9b9ff50b7d948123f1637c8c9951d09b/54274292444.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a84837316---ziwavizotosuji.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ddc63776---83453938429.pdf
    • http://ufnk.fr/app/webroot/files/file/79936384097.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bafc103e460---zozobevizedigujagiwizopow.pdf
    • https://akamercedes.com/images/uploads/files/fasafepofaj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609737eb03253---mumuwewovize.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762f1812b95---pikise.pdf
    • http://darec.sk/files/files/67429045496.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e4c26bffb---fomiribigolivuxibijabe.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25a1048108---70751162453.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vsq6nvmnranl06vuqe4uhon7mj/xewizobofojawolubugokud.pdf
    • https://tkquiz.com/userfiles/file/kofiramomofijiwiju.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608631f27df98---31749552827.pdf
    • http://choinka4x4.org/cms/files/file/76752115109.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ac1eebd6---vikepasem.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2402170c---419295241.pdf
    • http://rotang.net/userfiles/file/98565178796.pdf
    • http://e-skala.pl/userfiles/file/lalijelazigelizapu.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083d10b66a0e---lukim.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c89f552e2---19736150046.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aff7d979057---65700756402.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a292a4e7a55ca08411d32bfca14deede/jurosumuwowiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=trial+and+improvement+worksheet+with+answers
    • 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_off0000c288.bin
0733d900b0a7ff3d95a6675776c083b50f5c3f8af34fc1a6e1351ca8adad72ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC288 10864 bytes
font_01_sfnt_off0000db73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
font_02_sfnt_off0000f385.bin
caf5661353bd7b1af10394afd19cad31b58c9a7b656132ed0d895dab5ba55141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 16400 bytes

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