Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e5ef45d7465454…

MALICIOUS

PDF

87.4 KB Created: 2021-08-02 10:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ea10deb3df4838f87c3a0e5ed5ad526 SHA-1: 2ca4679ed381211f948e6e8395db802eba2d5c2b SHA-256: 54e5ef45d7465454cfb01e96ab466155a01074eb51986d9d266602cd693f97c2
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/31287792674.pdf In PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1314008743---paloru.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d197888ac---bidonufapokumugemabezaz.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/10483086866.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/nipexupofut.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/dc5406273468867fdf8c2294b1f4c67d/zilujibakerub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b3bbff8a---bazeguzepogoji.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/61009479668.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/munudewajev.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/bupedukik.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1d097d55f99e0f28892e39ba24c40353/24649040016.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/39702620449.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/36799664716.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kuneba.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/rurolozosif.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/45dc0f0725d431931ae54de2aba27240/65031650874.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f1792ecea---jusariwibapaxijobapoz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/af26000462d53c3f798f0357e036e48c/57853633244.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/744238f524846807a71ab721b94beee4/85795398442.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096956d3a919---13030343869.pdfIn PDF document text
    • http://balone.net/_upload/file///rikofijukoxifive.pdfIn PDF document text
    • https://izometal.net/mm/file/zerinipigavokurafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+discord+on+chromebookPDF 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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16816 bytes
SHA-256: db999796b5f71c0effda1eef8af58cca318dae1584a297fe347e4f0eb0b3d984
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 10836 bytes
SHA-256: 94bd9db1d2f376156cf13c3525ddd230c785d10ea9ae83afda58ae627ccf8eac
font_02_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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