Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95a1641ea3a9446…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 23:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db359621c21979cb4453fcf809826934 SHA-1: c5b37bee8bce76046d7802a63129613b14588c04 SHA-256: c95a1641ea3a944680f5d0bbccde2ad4275a41608aca89a1224a4d00250e18be
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ClamAV detection and the nature of the URLs suggest a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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.
  • 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://vietnaminsight.biz/ckfinder/userfiles/files/varepapisox.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b4615scph5qe32sbc0f057pd4j/28938632284.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8ce9779b71c6eed97b4258a2f6d4ad66/delanuvitokowosijaruv.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/38624792707.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6cv79vfddjeheb0dolq8tn8cqp/fubiliv.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/nosenefev.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rrb6i7tm4it06qn6npu26j44b5/jupinufil.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c4d1d2488---jepapubisuv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095eec460b1f---68459454860.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/65914494352.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6cd5a3e835ae537ec60b35b719b46fb5/tarepogomerixoxit.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/konobajo.pdfIn PDF document text
    • http://mesterek.net/tmp/luruvafenovovan.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b35e71cb---86556714280.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07e7a1b98---63182433393.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/kibejuzivijakoweturilupi.pdfIn PDF document text
    • http://argumentua.com/i/file/7352932377.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/vafenagimiguvunadig.pdfIn PDF document text
    • http://anna-bel.com/app/webroot/files/userfiles/files/nunadetizulezu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5195d04d7f95e4e0489954850c26295f/74502639901.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/59251616553.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/83946592857.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f3854cce---26641687868.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d66681aad---4966196197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=for+the+message+of+the+cross+nivPDF 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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 10780 bytes
SHA-256: c3e336bbaa90916d0fcae8f400806cf3e51824f2a9eb9a109ea2fa456cb56a64
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1