Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a3c3dd31c6628b…

MALICIOUS

PDF

70.3 KB Created: 2021-06-10 13:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 616c2664d5aa9d878fcc4e8aa1cb3386 SHA-1: fd2a778794a52aac0a95f528f42623c1b59797e8 SHA-256: 22a3c3dd31c6628b89d440fb67092f710c45c1a4524fcfdb1ec6169f1c55fe3a
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on potentially compromised CMS uploads. While no scripts were extracted, the presence of these links suggests the document is designed to lure users to malicious sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8600

Heuristics 4

  • 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://cructi.ru/uplcv?utm_term=invisible+man+critical+analysis PDF link annotation
    • http://eszixv.hu/ckfinder/userfiles/files/tisomolidiwibojom.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/09b90903da483bb6b522035805a25056/60730801887.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c9b02853b---vaxozifolesa.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/newatulabukepiwobetof.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078881c33bb6---43841649394.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/90acd45494677d8106adb41d9d5e566c/fefupanizu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/37d69bcfc66a26f507f8468807f39947/toxaruwobaxi.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/dunajufodumawan.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/408b4bdf930495655b50f5a59c1dc445/tudagin.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/xamozovuwisedewumesevus.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/talinunizezusukikejud.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/779670c9882e53eb52c3e33a8f02054e/wufazisaderuwibup.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/3531586811.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/72675164380.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9a53e4a2e---99595595870.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_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 4864 bytes
SHA-256: 5f8d1c1937d2d9f5c8014c60646439a1e61f1888dd61199d6d28dd52419b6b5d

Open this report in the interactive analyzer, or submit your own file for analysis.