Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff39daf5477b4225…

MALICIOUS

PDF

62.5 KB Created: 2021-10-04 14:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1379d651023741962f6960bbd1b50fa5 SHA-1: 04854e2b0e6007aa4127f3d1e958eac3ea1fbffa SHA-256: ff39daf5477b42251d85bc2e75be6930ccbf80d6962ce8b02177460bb05faf68
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing lures or trojanized payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4598

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 https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503cbaed2fd---16303463330.pdf In PDF document text
    • https://brakos.it/file/18352645294.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/rerajebedad.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4696387d2e0df26ef0ca95d9ebd83a72/70268096075.pdfIn PDF document text
    • http://thietkevang.com/upload/files/tevez.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/namimuputokazipesexupa.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/7933785468.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/23794137352.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b267f7a73ebe5e0396c547e1e133ea1c/dumutidunovisepisonemawaf.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/nusakamur.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/12285663024.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/40899772176.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/powomudenepuliwes.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/lilujomepaso.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/morudinesasu.pdfIn PDF document text
    • http://slipa.site/0429/upload/files/68003936833.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/72650594415.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pobadisaveruvit.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0d8aa8d6e---33542313247.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/13971161069.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/wovetege.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/15407145011.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/59442018396.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/10761088494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nt+scan+ultrasoundPDF link annotation

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