Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28ae2238e8ade62…

MALICIOUS

PDF

76.2 KB Created: 2021-06-18 13:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7601e09b30b08f9eb1d48d530377f1df SHA-1: 12c048ff7c230fd63e7b32ad84b40108cce58550 SHA-256: b28ae2238e8ade62f3de2c92f81ef7d844ce4a203e35dda45b9b716df32d80ac
94 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to potentially compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external links and the heuristic firings indicate a malicious intent to direct users to external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8089

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 http://sns.hu/_user/file/lebaxamuxatukuwoboxedanag.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/45231998518.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae6cd679f---25114470557.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/etq0o6skq4s0vciru12phlpmbs/ziwedigomazak.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/dodexajedivuwimu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/lpc914chsuikrkr48bph78ggcs/57555636829.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/suwusabivogifeja.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/13290804994.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xazelijojuvewi.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/32594664410.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/43819640675.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/51698793462.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0e94111f0cede1ea00c41d5a8dec43ab/31313992186.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/tomiri.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e89c3d82e2da29c4d9d694b5437b3e9/79985821317.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/S30rS-6n6vg/uplcv?utm_term=clothes+for+vroid+studioPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 11796 bytes
SHA-256: b4c3ccd56fec439f520c123789a92493a445956fc033ee54be83356bf0e5fdb6
font_01_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 4752 bytes
SHA-256: 70ab47bcdad5cd3cccb08100f9f4a641471ac76beadd5dc5d222d8ac95a323e7

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