Malicious PDF — malware analysis report

Static analysis result for SHA-256 0930ca0399ee803c…

MALICIOUS

PDF

60.2 KB Created: 2021-05-14 01:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d3d1f62263dd305ec051b1db8eccc3 SHA-1: f15d1b4e576a528d7e9143d505398d6c5810ed08 SHA-256: 0930ca0399ee803c453e0bae0b60983364bb1d38392fe5b4d1fc58cad513c9af
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV identified this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 5

  • 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
  • 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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084461ba9edf---96736159903.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48e3c4fe1---29239872845.pdf
    • http://okmarin.ru/userfiles/file/89078108893.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160818233b080f---22809885333.pdf
    • http://ankurgroups.com/userfiles/file/15803567668.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d1ba5f8733780aa2a253ffae3a6a47c4/62654196261.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hubv1vea4q2h1dngd2ccocd1p5/43799355987.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097466292e77---goletikuzimidigokomarem.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282aa7b86b---9864567128.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/487tj2b5t3virgtfqpi4qb40re/40245081288.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6qvdmbfivhp00ffbhl5erkph1t/basowewutowafaragagafeji.pdf
    • http://hasyo.net/files/file/tufesebud.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/76f00b0f4427b1b3996f3c00d76da3f4/duwijiwaxodesomiwesiwik.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v10s277o2lg2e57p8pvqpbi219/nuvotuxozeweromuzimotizen.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac105be9---99318656449.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba9d289f3---49531324904.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chlorophyll+and+chloroplast+worksheet+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22c.bin
d87a80af2c15d036c2529d09a98807b84197b77da65fc795bd701c9b51e97582		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 5324 bytes

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