Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba680daca78846de…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 21:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34b4e025e1e48ae1935b4cd858e4a5be SHA-1: d1c6ea9b61a099394c9114fbf69ec127eeff162a SHA-256: ba680daca78846de05eba4860ffe66c168474be83d369d0772396a8438743721
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL analysis point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/42728991787.pdf In PDF document text
    • http://gtlitalia.com/userfiles/files/linujikopeku.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/xerozorulunanufid.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/26496198616.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zufinole.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/72285770955.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4e686135e---84403758062.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/lexudusakefobotarezaxeza.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f803479f---29159226575.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/15504304921.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/56890184336.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210915_160641.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/80734812420.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/70537013918.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/29510528745.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/fb8f78406ff3350857d1563346d95f56/wumotolujejudo.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/wejefavigati.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/xivevegunugazojule.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/seliwosorilowumojoge.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/lapedodabixoje.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/dujomuwupexesigitenaxi.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/damopixesezewunezalajasef.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/panavirutub.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fenebudegibefivigonixu.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/26128349904.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tapufarinopof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=v+recorder+androidPDF 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_off0000b4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 15752 bytes
SHA-256: b06d51bba0c4ded10625009df0f16d96daa0e876a071cb711a46d171ed7ebee6
font_02_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10020 bytes
SHA-256: c91398b78281601aa23c1f05999b0e39f3759e9516f65e7d6c9180cb20e3693e

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