Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c957e88a36beb5c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 15:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ccab17981e27383beb9fa8a7e3b9adb SHA-1: 7bc65a66aa13fc2ba186885752dac2ced4b6e3d3 SHA-256: 4c957e88a36beb5c3aaafa83f663b2a541ac28efa9f2a4b631c4f449fff7cfb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/sozawibazidop.pdf In PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/sataregenezuta.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/98539616952.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/68750448364.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137eec130d8e---vizikezazu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613425725fce3---36636708899.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/nudukanonu.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/46386923059.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/putedapigutofokemuvef.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/41959788428.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/tejikulunakiziteza.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/terujuteje.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/24182691748.pdfIn PDF document text
    • http://jawarakreasi.com/file/95022828945.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/41936e9a09e21e700bf896325c05ff50/ninerarawukezixiji.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/60aec650a68c6b6b06fe5c5c1fce9d35/71303404047.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/mopoxoganidupedaf.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/vojoliba.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fb2b8e7b---winepowufenumulemu.pdfIn PDF document text
    • http://ccshecea.org/upload/files/4645813543.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/duzagetenoxadoke.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/mixepopixapaxu.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/36929533619.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109080407364263.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/2962955131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=betbiga+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 17836 bytes
SHA-256: baeb504d1b80a77c7b155b6d6481d052f5d81d3507960c2ad1567e725576f694
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 10672 bytes
SHA-256: ea43a734f743df5a249d74039734e8b044089df6a66fa717a55a3fd5f262ef84
font_03_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 16284 bytes
SHA-256: fde65c8cb77ea83157e3d1502ad2aee58f9d3905ec9a641983701f347f9e5115

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