Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ed3441f5554ceb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 06:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 134bc2d12deea8a048e0b002425ef142 SHA-1: bbb8d0f005576250ce12e1f79fe50f683c4e6b6b SHA-256: 14ed3441f5554ceb0f4645bdcdd4a11840c3b0214237b1bbf328d5373a83c4b9
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to execute malicious actions or redirect the user. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4637

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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf3a814e24---13998079796.pdf In PDF document text
    • http://mgbig.com/upload_fck/file/2021-8-23/20210823175440318919.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/taluniwivawa.pdfIn PDF document text
    • http://ctm.it/userfiles/file/9251617903.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5e8f60731---nopupujiv.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a67627ce6---zelunolufupuvedinaretut.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/06348998bad364cc5ae499de916c32c6/67573029523.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e7089bca0ac0c315b377a87a0b76cbdb/jilapadit.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/50765290847.pdfIn PDF document text
    • https://verner.lt/images/files/fubixusewazi.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/golimujogesutiriwepo.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/guvotudos.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd589e2a0e1---69078513175.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/bogufesobuvufakupifuvof.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/964b3b7a4da763c6c21b398356329d96/nuzutodamaragufevudef.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gebobaxovazoromikabuxes.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e7ba5463---19377789658.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/4127923674.pdfIn PDF document text
    • https://carlojans.com/cms/file/7718867216.pdfIn PDF document text
    • http://hongdacable.com/d/files/sinubesowopufamumorimozeg.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/2b49gsabc50uctfbn8ja18njo5/jinizisoxane.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/93118364402.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d5vd6qp692e70283jpnvjopp81/36924812736.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/71548981152.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/ralena.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b70430155ad---dopefemizirof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=osteopenia+nhs+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 17812 bytes
SHA-256: 1b8888b45b230a1d7027e326e37d8dd9821a55903c93430c200e9124fca55be7
font_01_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D82 10476 bytes
SHA-256: 5a01f929978737e9beb505828dd2b04c397a02aeebb2a13bc95ce37b962ab7f4