Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a42882367eb4f5…

MALICIOUS

PDF

79.0 KB Created: 2021-08-06 08:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08bdbff5e94cddb0ee6f44a3169b6e11 SHA-1: 23a6e4c362e43fba6132edad8f4fb2e745df9a24 SHA-256: f9a42882367eb4f57b9c7492689ffb69ff9dd4ccb4934be4573a2ad1859fc97d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of external URIs strongly suggest it's used to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9139

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://medvor.ru/uplcv?utm_term=scavenger+hunt+template+for+schools+and+classrooms PDF link annotation
    • https://nvsrolko.org/ckfinder/userfiles/files/reziduwesazipegarubujo.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210727_5EFCD9F2CD73685F.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/6712410901.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f9b4efda---mosorapavu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d13558368---19707403960.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ad1babc78---76937218949.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d8c47d8a5---fesebugaxulubun.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/88628746370.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfd40a9d7---dafuwilopiz.pdfIn PDF document text
    • http://yilip.net/userData/board/file/faxenelefegasilo.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/43093038416.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d2edf37995c---xuzoxiwotixexosibiguseta.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ca64ba48.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46cebeebc16874771f7d711df9ed17b3/12204862245.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3e0efcf37502ba0dd171dd735547bcf4/xofimogelikilu.pdfIn PDF document text
    • http://distributoram.com/files/file/477964435.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/gowowinabikulil.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8pe2irfn7jo1ra94u6neu00675/23365558624.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/72b572a44af5c5ef3e68d2db9b2dd25a/jusiposavupamidusijofumex.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sejugobufutibavas.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wafunetiwumikometepenagor.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/24982316876.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/folix.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609830872d437---vuvuxawizoje.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/xokudug.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/20568347038.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 17732 bytes
SHA-256: f339717658a7ea86049bb3a7212b0331d03e23d36ed80b7b2e2b7f244bb2b4a6