Malicious PDF — malware analysis report

Static analysis result for SHA-256 911162ea38a1a4b6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 13:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2145911ade1f8ce0a98a363217bb8ebf SHA-1: 88f40ea2d21d9c32e2d818bf95456ce58dac51db SHA-256: 911162ea38a1a4b6c20f96a9d92874be9a163fca769f5a2e69b9a6ee3182884c
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a remote-support tool lure. The document contains numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. While no scripts were directly extracted, the nature of the lure and the embedded links indicate a high likelihood of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://hattoco.vn/images/ckeditor/files/rupedexanasojeja.pdf In PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://cartopack.be/Images/file/ribez.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/25948775377.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614653dcc3924---98125962494.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m20khmgsgecn8leeh8f92d3kvq/47650727852.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/36040123603.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/83929798655.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/88825132859.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/8917939050.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/19990765701.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614af80b1352f---rolitubigofumuz.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d5c8b876459233daeed5035eb68dfc66/gesodibuvoretujitonorad.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/velixumumetakamabogaxa.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/sefogasafaboma.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613129e34197d---vikapozugi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99b2194de---desibitupozokelabewa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d5df3dd202cbb3b4075120a373df549a/74095425005.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/mebigatawotetajadigomaz.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pawunuv.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16151dc0366c75---tulozizuxutoworuvute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ap+physics+1+formula+chartPDF 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_off0000adb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 10756 bytes
SHA-256: bbc0aee37dcaa128535b2058e940d084ddd8aa21b09d7244c67bace6157f0e27
font_02_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 16548 bytes
SHA-256: b5d509779fec7c0e755dffdf321b7e6246001c45fa8e9b32617775a6afaab498

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