Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7f90e9fa7ea484…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 11:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2165f52b7c01fdce6eceaac20a14be0 SHA-1: f88f0ac2f6c89714179490cc335d5d37e098782e SHA-256: dc7f90e9fa7ea48463b9e027a0516065b6f868698982d4389648ac12d32194ec
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS upload storage and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to phish credentials or deliver further malware. The embedded JavaScript is likely responsible for executing the redirection or payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9mdclup9i196vbi5dmavqhb9qv/fuvivavupepaniguxuwomagi.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/97104708161.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/21880931679.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/31941894578.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1dd4dcd1---45210793294.pdfIn PDF document text
    • https://fobh.net/userfiles/files/fijelawunux.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e5373d1---33407842981.pdfIn PDF document text
    • https://premiersuli.hu/files/files/59099738065.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/93200416129.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/21580398620.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/89488207868.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/97763652483.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/91352196286.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nedosimumogiguzoteb.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/muzibatusikisuxuto.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/diverukovimimetalazawox.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/sibowemuditote.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/lufex.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/46419766459.pdfIn PDF document text
    • http://akilanews.com/ckfinder/userfiles/files/12048148264.pdfIn PDF document text
    • http://hongdacable.com/d/files/sotodolefukaxupofarawofi.pdfIn PDF document text
    • http://jonme.net/ckupload/files/81114554314.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109140751032328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sexy+video+calling+app+downloadPDF 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_off0000c4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 16724 bytes
SHA-256: 17fd4f8d4b6c63c09c9259da161c2dfcfeb17181aa550d3cfd28bc332815d55a

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