Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6cc2bb68487d03…

MALICIOUS

PDF

123.9 KB Created: 2021-06-03 15:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 38323c5a8095929001a1172eed7c16b1 SHA-1: 29605521f058405c884db8100d8f43f108b4e230 SHA-256: 2c6cc2bb68487d03d32b678a27e3c754eafd85523cd23599a6676b67f3d438e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a6c5b05b---fuxexifawopibepetojopiv.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786ce8bf5dd---vofumijiviwuku.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/6373926850.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/rnaveih8h6t318trjjkeh1j8uv/wofajapakevosoten.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fc073bdceb2d4d11754c5e202c073fbe/58419345555.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc7f3bff1---15536961932.pdfIn PDF document text
    • https://bselink.com/userfiles/file/47902171457.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bee24f55---xomovamogupanawiz.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bcc5f158d4e992196c2c91876f439707/8167731095.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9d8617572c3cbf8fabc5d251d0721673/41333756050.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1f9c42f707a151b747bc3a9aabd6db26/81099477075.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u79ad4dj9cmin9hh8v2pbu19i6/93729209419.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ececbc064---rixuramexuba.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607971d79ddd6---kogosedutologosegane.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210527041029.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3de439d73608975c5798938933e2bbdd/77151645031.pdfIn PDF document text
    • https://mmszke.hu/files/file/zolekogesorukamutufemuvil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+be+an+air+hostess+ukPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A471 4996 bytes
SHA-256: 80f43486963e495e1bb7a16c7b0065fabc2e08fe61694c179c4b30843ce58418
font_01_sfnt_off0001b573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B573 13740 bytes
SHA-256: 5be0bbbd431bce2a4445515df380a8d730c91f6b4a28801c041b9593d2b3dce7