Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e726b5bec064f7b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 13:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 183039348cf36a331ce8d4297f2cc954 SHA-1: 8e5c947d49a96ffae1c65432a2532c8f68a55aef SHA-256: 5e726b5bec064f7b20a3f0752ba01c51f997fcc244bb8e4210a79946879aedcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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
  • 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://ostrichpharmaceuticals.com/userfiles/file/dijula.pdf In PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/pofoveruli.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5viduio0nim1lr88cjojodakq/68215295565.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/211933b07e17c5694d1fd2e4eb05c922/gilalitupu.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://location-appartement-venise.com/italie_documents/files/mojumopodamivemadupolimo.pdfIn PDF document text
    • http://3sdent.com/upload/files/lazalekafebum.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/rasajubuj.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/45698349678.pdfIn PDF document text
    • http://renovator.cz/files/file/19362305565.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/38068074065.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/93858435684.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4c19d7580fb81890e7570c63061b42fe/7325962710.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93642aa2d0---24221524201.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/34296220022.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9d69c9d5---17427576759.pdfIn PDF document text
    • http://erictex.com/ufiles/files/36170914103.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/j86u4lf5erlldcquencee1rcn3/23152453748.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c20c8a17104---nometunubugomalow.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/magilasepame.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65c8c9624---nowinadigorafitelulevegij.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9069c29e7---gukojeduwuwoxitozaruget.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/nolovuranilal.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/52652122541.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fibuzavipodo.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/kulaxeloxad.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/77319616190.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/078fbf148d0c3e8ad681d7a090d38096/revijapimifipupoguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=revista+turma+da+monica+pdfPDF 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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 20272 bytes
SHA-256: 40323ec5a2f7737cf1c0105edb776345718b3d8be0cb0c1cc5d3b1a79d2569eb
font_02_sfnt_off00013e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E35 10948 bytes
SHA-256: 369b6fb2526d43cad237277716015eb8f159f059c446b8efcc9d25960fd22414

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