Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca54c0040db5562c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 13:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 5fd89f95b3f4c69aeb5a539eae1cddf3 SHA-1: 133df79e4c0fdfd554f27c1ca6938cb857f78a51 SHA-256: ca54c0040db5562c7070d7aabff241891cd916b8fd70075f331008fac911754b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0732

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://rehahomecare.com/upload/editor/files/suvozefuwo.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ef75376a673a44408aa3161649fa87cb/7696977098.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/42299949684.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905174511.pdfIn PDF document text
    • http://jar-ted.pl/file/gowabafopug.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/52248061069.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161373d8113c0f---50195720517.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wifovexafugen.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/68881069539.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/ranalox.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374450babed---tidevozolevurisara.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/nizizuwejo.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/rajofojofofolig.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/jezewuni.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/gusam.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/dazedifojizogi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613604132d07f---mugadanuwuma.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/peviwivuxojuzuro.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/30749105220.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a5d0f59db758e8256d5f92012d32d80c/82446892313.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d10066883---62548401708.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/18121043201.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/sugasodibebidenev.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/41638455443.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/47009880119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=les+hirondelles+de+kaboul+pdfPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/dogaxolopi.pdfIn PDF document text
    • 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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 21060 bytes
SHA-256: adde2f746ca952942bc6f9651a342f9d17664cc5d6ca5cad9c1f812ae3e49198
font_01_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 10788 bytes
SHA-256: c9c6fb94dbcfd54f04d8dcaba3a16dffaa8f59d62c6e3ae7b8000deae29680de
font_02_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1