Malicious PDF — malware analysis report

Static analysis result for SHA-256 b408cef4512bc6f6…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 08:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6e38371e9218f9a36f708faaf7ca820a SHA-1: 663cd88c7fd7389ece2e5c8548699d8c02aaee85 SHA-256: b408cef4512bc6f66e9252907ba09253cf22b8e3bae9ad71d22d8858590f0deb
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including impersonating cloud document sharing services and providing instructions for password-protected archives, likely to bypass security filters. The document also contains numerous links to compromised websites and upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/cij19ciir6m0agj798pjegolhs/78989326211.pdf In PDF document text
    • http://edwardnugent.com/userfiles/files/29936210103.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f5fb8bf54---13505425587.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/31688701585.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/nozavaferesizupugukum.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/30480244026.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210520002234.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e35e35d084743688a9b4c0b1902f820e/25413595345.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6e9f216b14bad7f75fa8e615911e295a/xerewikipivolutuzolib.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9daf6b4f48f76c5a3eeda7ed6d6bed71/43071235866.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/52473178508.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d226301a1---91958271849.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/34154834053.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83d9a5f475---3314135195.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fb334b328c735ea309ca7bfd00ddc9b1/2401135916.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb29b671f---50761083783.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/96b160da20913a755b854c6679dad3ba/woguz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db7d9b38749---golokugizebivarozulixo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609af788a6702---zipomitodikusojawogigajot.pdfIn PDF document text
    • http://aps-mes.com/files/file/fefexisibe.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/vibunabonawopudif.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/740d0a29c0111b819cc762785da94c97/korifenakokowudapoz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c77c24e5---naririzolilazeviba.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/gitufojotilekomapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=winrar+extract+onlinePDF link annotation
    • 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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 26848 bytes
SHA-256: 7b77cc196b8bf1bde9cc7a6bb854aa3dce80df2cd07ad911837c71e44539dcb6
font_01_sfnt_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 10148 bytes
SHA-256: 205372113c825ce0ba01f98dca09fdcaa351b9ff67f5ede4b73805cafa3aad31

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