Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da4d6e537f6403e…

MALICIOUS

PDF

99.3 KB Created: 2021-07-05 14:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b472afe7c4e01bfca3d3c37fb8abb886 SHA-1: 82a6a6ef593af2a63f472fb73b15f2e86e30c174 SHA-256: 3da4d6e537f6403eacc39be75bd424d15c66cefd1289545025a22d87040de98d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, directing users to a link farm hosted on compromised websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely provides instructions to download a password-protected archive, a common tactic to bypass security filters. The presence of numerous links to PDF files on various domains, many hosted on compromised CMS platforms, further supports this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf59baed69---30306095122.pdf In PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/26079509190.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/kutetosuzatolunamalikupex.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/6862888729.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/555a06c9dc879c9466c116610204f7d9/kubapomit.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/33487004035.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb185b604---44844593577.pdfIn PDF document text
    • https://t2sc.me/userfiles/40737616130.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac93c7e62---63287691856.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8ef3fb1a---pojupenigakevalalef.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/97703622151.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f7c62d81204e3b51f63b521c1bd6778f/bozugu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0434bd705---65204608628.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jlkqond2at8iu5uoea1nl6vrr8/viposadi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/17836389195.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/46006023339.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/41375395421.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vapagagogivurixer.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7a55ee205e08be3bbd6d87a0bcda11a7/vebesuxeduvofibefusavon.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa93789387f74329e702ee511ad49004/78652102894.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/23413754491.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba38a9591---potunefuvugexe.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/lifevavamibexojomun.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4bf17391673b2629db8ab8ac45221dd1/72607336274.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/busibujajufe.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3e80cc07f9852b9a5dfc6d888dd3e0c0/xilafofami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=port+wharfage+chargesPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/muzolesugerisulikaxose.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 10460 bytes
SHA-256: bc4ea3ac5c4451accfbba04513e18d091d9158fffeaf3d46b1433d051f223ccc
font_01_sfnt_off00013c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 16972 bytes
SHA-256: 9e1497a56ce6c8d0480d41aaf751896eb9db52ea548e04690199e84c9a4191e3
font_02_sfnt_off000167d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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