Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b378de31ddf757…

MALICIOUS

PDF

99.8 KB Created: 2021-06-28 05:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62f7254df86be9e945f91dd461fac5fa SHA-1: 1641365c2b512dca94da2a70b656401bf207076d SHA-256: 78b378de31ddf757797f0a43de2e63e382836c643eba7295cac871be6a4ab6df
132 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 CMS uploads or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4839

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://bloomx.com/sites/all/sites/bloomx.com/files/segetigudimim.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ebb3be0b7e0539fba6640461c39c3bec/punigidenagafib.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wazuninajefafav.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb5777c324---nepunixiburuxekipoz.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/3ufgsd4b04i4ane3ej5cnklm0t/46155765253.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/22914138890.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821b54d8193---zewabute.pdfIn PDF document text
    • https://menu2uplus.com/images/file/4447489373.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/29425230266.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1ca4aebfc8b9ffd2328f55593ac8b62f/wobogoxiwadudokutov.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vovajigagokasumez.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/bezemopepexuloduvamodaneb.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vanevo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7947f0fde8---50831658745.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160982dde608bd---43880251396.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bead60810---47034825008.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a29128c0---pefuxi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086424997d7f---2423125735.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210620152652_086ovj.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb576f45871---sulivisovojupozujuwase.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64d9db5a1---dirisoragonudidame.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/32f8da86885a37f0b409cb8c2fd9e5e6/tegogef.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8027bf31---75475735700.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/gijuvemidepofusetadegezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=discuss+the+philosophy+of+moral+education+of+shah+wali+allahPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000181d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x181D6 4808 bytes
SHA-256: db848ef61f2200c332a3c31cbc4a2d2907ab34e1afbb9237580f0dc17fe0b4b2
font_00_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 11184 bytes
SHA-256: 555c66adee45e0bda942f6c95c3e8e4ef030e8dd2c03e671d73bcc40dc05854e
font_01_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 19212 bytes
SHA-256: 971feead9ee014dc43a687f07cd75f680631c0a0b304104c0332272ece869226
font_02_sfnt_off000169c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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