Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbd454f90b0868d…

MALICIOUS

PDF

79.7 KB Created: 2021-07-01 15:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c4ca414c060322089e351f54d24a38f SHA-1: c99ed77f6f22a96104c9198ede13c9763089be2a SHA-256: 7dbd454f90b0868d6d9c0c043cd000bbf0c00d831cf77d5091180320cabdc3a5
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing content or further malware. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically indicates the use of compromised content management system uploads for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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.
  • 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://sllight.ru/design/img/upload/file/80230415760.pdf In PDF document text
    • http://muacuoi.vn/Pictures/files/35015352823.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/37782142891.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090968d982f1---48697566067.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/acfj4lvbbtslfk899lsui3av5m/nazejefibamozod.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/211995882660d1faf6536b8.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/pezuzenadotawexezelobu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/78755066204.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b77c7c1941006ca42dca8e9e3f99cf9b/mibabufemabum.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/004f1f1710dfeadb4cf8a6fbfe15d41f/nuviranonu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8jj9e6qlupamlilpumkbb21uu1/sukire.pdfIn PDF document text
    • https://paperland.bg/uploads/file/penoxonux.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/nitigunowusotiduwur.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b476123a1274e83ad49aa498d1851fe2/6401103581.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0402d2242---84054648876.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/40933506528.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p73tipciu6q8mvglgl937ggcot/vudek.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e8d7b459---jozuvozaluxuwigu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/465c73cad23ad0f870fb2330496a34cc/21194635548.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pululakinorutijijewe.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff56153fa---37970409163.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccefe5b8b1---51480857699.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2f69c479---34146387909.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c389a997f5---dagonub.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93138eddc---65116185013.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bafb9400f4---3561578052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ganglion+on+top+of+footPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 16676 bytes
SHA-256: fb90658343ac9b6c82fac5c88bf119ef4c2ae1952986d555f7530596cda7ea94

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