Malicious PDF — malware analysis report

Static analysis result for SHA-256 2342aa577ccf3adb…

MALICIOUS

PDF

59.5 KB Created: 2021-05-26 02:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a490c8ee65a46c7ab10e3ae94ae8443e SHA-1: ea84655ae3db8fe20664649a1c51466c5fb14440 SHA-256: 2342aa577ccf3adbbe870d266f34a61cebb9f17e6426bbebda28325e53366747
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'Chromatography lab worksheet answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8554

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 https://laborke.ru/uplcv?utm_term=chromatography+lab+worksheet+answers PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc589f2f42---84811585240.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37af35f02---48196897218.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc77e20503---48928195450.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba9a62f92d---10109951706.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/u854n5tblrggano20f512i09dr/tawotuzoze.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lajumilirukuzafiwujijak.pdfIn PDF document text
    • https://mmszke.hu/files/file/levabizofowe.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/150420419890.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ugof7n9f7q0851lm2vjqip72fc/zosemexemej.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d90872010bc7405d35e2fe882e1961b8/3037183227.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf91ca9e4---36322597083.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608784971c39d---fexekamukufewodonan.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839ab817bdf---kamopew.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfea39906b---66886001387.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a143448c0f---26785670280.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gd0k292ab7hke64fahafqt6b2v/46612538278.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9r97icjrb8md9uv8aqb6007dtn/45126125973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5536 bytes
SHA-256: abb4aaba6f338156f8654e001ebe8c091ec083220fef304a5b33d78cef934ca3

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