Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad75d11f97e0f595…

MALICIOUS

PDF

78.1 KB Created: 2021-06-20 17:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ce6e434ab337cce3ac28177139d35649 SHA-1: e2d365880a97b6b76a047b63f6b1bb2e64633459 SHA-256: ad75d11f97e0f595c6db9038070b3958293d42bda5edf60767f1bf7d7aaaf356
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8621

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://ketchas.ru/uplcv?utm_term=what+angles+make+a+hexagon PDF link annotation
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/12b62f20bb60239ffb4ae8e56f0f4bc3/wumomazuwotevuwawunodemag.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be79c6e0f9---62343925521.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/6654836391.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160871a824c54a---26793492657.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160751be4a0a04---85354602594.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/fefopaputawazi.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/11867220185.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tlo8rv2cj8shfurkvkhpmuuf3q/9964556982.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60f199a167f23ddfa9fad0f6bec87a3d/29204640482.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/j77gg57lf99i2jsaeupnn4cp6r/61725716142.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ffcedbb698d766e7a3f5ba111b771d12/25931926892.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90a4ed706---fokuxepe.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0386ec378d---53733247863.pdfIn PDF document text
    • http://bienbao.org/uploads/files/64772218105.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/vterno2q8beo32e8v0vj7ra5vb/46109888452.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/nerilarogotawilokise.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/453794c7473ad54f0f3d055f4105b074/70350431648.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8f38e0e0---votatal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 5148 bytes
SHA-256: 6216244535e5c3b866801b4902969e3b5a5c10d72cac5a29410259db9da527b5
font_02_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 10868 bytes
SHA-256: d4d320fe03427a94025a741be28aca0c32afdafd2549677c933dd6840be1a5ef

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