Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3a89ea0221b15d…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 21:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: feb592b3c1fffe42a1d262dc66f0c6d0 SHA-1: 6f626bcda42cdcde0cd3ea60ca836a5752eec826 SHA-256: ad3a89ea0221b15d4454e78b313b1e91f7892ddb2dfd1176ce2384c42f1ab409
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into clicking embedded links. Several heuristics indicate it's a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdff882c85---11631504016.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/be9afc2457091fe64a38b04a57cef862/xozapuzibulu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95155d20a9---kafolezojifarazukoxokufi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdfce405f3a9aa0dea62c9ae9de7001c/ronolijalubatokosabitowek.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o88mi788bapip4dakk0iq10f34/38624335822.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/39619879450.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/63023435075.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6b149cb9---57427131001.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ade1ec361---72624678916.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be1c79c79---51256170580.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/57668611681.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/zuwugadililimowavepodiwe.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b72aa22f---82341254488.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d0362478606169847f7b610df383be9f/tasonugifemivo.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/90028531662.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/gisebup.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160851ba4e42d3---mowunemowaxerox.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca0b8e76b---zinalenedojoli.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca6eeb483---tojopu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b774cde21b---lugamukozivuxobagovad.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4mukhre4bvadbksndsarbuj0dc/wupugab.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rik60h87e2ctih8tudl1i51c77/95532619223.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210618_1679CB3343494058.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pewofupuvikuxifatikif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+save+a+photo+as+a+pdf+on+windowsPDF 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_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 16904 bytes
SHA-256: 718534fe89c7dd3cc08616745ae78972eb8d6999c84253a62adb0616959b3b4d
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10592 bytes
SHA-256: 36dd03e1fe951c958eca38f01f24a1f8734f7ca300ba5b100acd81783f886e5c
font_02_sfnt_off000137cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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