Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23f9b8ff7e99333…

MALICIOUS

PDF

63.7 KB Created: 2021-06-11 16:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 594dfbaffa5809bad8cba78922d69077 SHA-1: 508ec73f6ae1f68ce3651c1cc7ed309081dac80e SHA-256: c23f9b8ff7e99333d4a9ec42bd14d85581f759170bf47120d6c2ba70bdcc76c7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to various compromised websites, likely intended to trick users into downloading applications. The presence of external URIs and a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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://allytemp.ru/uplcv?utm_term=hoichoi+apk+mod+version+download PDF link annotation
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/271024bb3d7200944a68e674d9d3423b/75252289590.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa4a56c8a---guburefojuzeziwo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e1d9c824---5302595278.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084496a812a5---98087421571.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/304ffsts42ll7rsj5e6jlm6ke0/54898280286.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/84849414006.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4ec39533---kupobodepisirujaragadupex.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607786ceeabaf---31312952209.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/xibaribez.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074231b6c946---jopixavadakak.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/26d6f41d452192ace2b9d924f31f063a/51751989159.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06bf8bdfa8---85839961923.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7obv93jq5i54fh1d75hgudai41/wufix.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/73800407881.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/27626788473.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/rakotunabazufevo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xixulos.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_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 5492 bytes
SHA-256: b81bbdec36e8a260d31587b9c060682a45140f93da8b027a39600b0b94ebc62d

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