Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbe5940c81b1541…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 21:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf0378f72174e244561e96a02257bb78 SHA-1: d450408818aa825df98157acd19f8b375a141aaf SHA-256: 2cbe5940c81b154107901c1e44823865a32329f94268ad3ea82adb186a15ee69
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic of instructing users to open a password-protected archive, likely to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://queure.ru/uplcv?utm_term=guia+ceneval+2019+pdf+gratis PDF link annotation
    • http://msslink.ru/userfiles/files/49333105367.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mowowot.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7vk9rlr510c8dspekp21o1rdu3/28565038017.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/99280646258.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/36710454884.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/925243226e31a70864f8ad12789b01f6/zinixaxudegalegamuduwuk.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c53adadj15pkeij5gmioumg1u5/jekapegazoregi.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/turenizaxuwubovodino.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/durotokojapivaj.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/492373d77f7b1a8175daa4a26d6441a9/61428621144.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/milizosizizatitu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb0b43469---19159309168.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/59d81db8ce8d2eaa41837c94d94a453f/pimimajeme.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210604/2002566569.pdfIn PDF document text
    • http://amandamaitland.com/images/file/tenevuxebodevoruvaxuz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d816d6ab---75805812055.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/44b0df245d5c0e543144dfc0953dadf0/delegode.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/punenesawosij.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/39054777880.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/724a44n8oci9mcpk660b96sie3/20001099212.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/38829267106.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/petorurotativozivolejiso.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3cd1c24f75036e3cee074d1f11614612/buviguxukijabuv.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/22670418439.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gieui0hmoqmlbi4lqk893ekbuu/pekabojewozedetuveva.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/lizimeb.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 11344 bytes
SHA-256: 0ce68d1c33a8acf829b102ef52fc84928362093c97597f8d84ed9114b776a2dc
font_02_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 18512 bytes
SHA-256: fcc3c638853038bcede54c1e0b3baa5f0441e7d294292c1bbb923960a7b036f7

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