Malicious PDF — malware analysis report

Static analysis result for SHA-256 673c748f8180b261…

MALICIOUS

PDF

96.0 KB Created: 2021-09-05 16:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1411ea9d692d33a46501b03caba5137 SHA-1: ff1c1c5592fa5f5bc457c862f13e96dd1b1e4cd1 SHA-256: 673c748f8180b261e529595685cd19ad0a7c4328f51ddd42a84aca51b4b100df
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.2015

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://ristoranteyuri2.com/userfiles/file/disanagadumajamuwuwa.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8ae96db8cf653f79c21b88c879bb27aa/383336531.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/kumoxubaned.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/dububatuwajosorodifar.pdfIn PDF document text
    • http://hanleyresources.com/images/46810710657.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/96c90df01c6e0192b62a4a8207ceb36a/xukewukekowumidil.pdfIn PDF document text
    • http://actinq.nl/upload/file/48748829863.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/8256918cf84fe80fe6da2933dbea9839/pepamixarubiwuxufebabi.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/30598750604.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/buvitanukifugadupokokabod.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/21538220997.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f6057243---22852926644.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/2a1c13c8544318c2f69c9998d92be2ac/77647548782.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9e36f1ea6---8448647238.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/339177587549cc3e4a6a94b984b2a692/80742650185.pdfIn PDF document text
    • http://quranday.org/userfiles/file/gevafikezimudegidifasoxok.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/85518528736.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/baketexolokuwu.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/47091365960.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c8cb8edf7f111eef9fa65a570ee4e827/varepaz.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/43311539437.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/netasexas.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/42924129712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=livro+adestramento+de+caes+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_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10756 bytes
SHA-256: ba63a9c924acea4764c6ec1fb4171725d4be80ee3a3073d4da20f76809db8c20
font_01_sfnt_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B7 19144 bytes
SHA-256: 410edce5976d1071d578b3e73abf8f57ad5e145ca1dfde6588bc370fe09c748d