Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c81e3fb1058a77…

MALICIOUS

PDF

77.6 KB Created: 2021-07-30 09:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 998347df112ebb7fd4503a7947efa2bf SHA-1: 238961afa5a0d71f6c34d4453712c6987d603c3d SHA-256: 85c81e3fb1058a77b7c94eca857b6cae5792759b0f64d4ff153bc8ed581be484
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. This suggests the document is part of a phishing or malware distribution campaign, likely using the embedded JavaScript to initiate a download or redirect. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9623

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607070a3f225c---65319146639.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f53b1aa3e38---dolinijefaxeduzawigife.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd90c6a86a---55928180515.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/dalidaxawaselizijomisuke.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24a6ead90---lowibozoro.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1c9c0ad2853f12c84f32fd1cf3f893a1/8069837700.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f000fdb814---gawidajaxejuwixivule.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/59691776590.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mn17ps4q1e76qi6kp4bft92e3d/joxisojuwajosozewenivog.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/biluvokugitafesa.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0457653b3e8fdf64699c41b76d8de206/13974378705.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/benuxodetevofaminawif.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/63376881732.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/11042316071.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a6c4b9e0---12197157112.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xodozusudud.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bpute5dp7q47c5j3i916clg1r7/5639835725.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/68965678456.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/77501685763.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/wudafatatawudug.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/23590101628.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/lubasudomugazomexiponako.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pagiwugigem.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c709d4ce---busunomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+del+baratero+epub+gratisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 19760 bytes
SHA-256: e80bfc29a00694007ef46549fbbf40321c56de508b82a9e27975fc7a89d791b5
font_01_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1