Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f53bc9a349983ae…

MALICIOUS

PDF

89.0 KB Created: 2021-09-11 03:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e5006a49bec138464d8760ca852c92c3 SHA-1: 4344c929342375bc596cfbf0e13c9593301cec54 SHA-256: 3f53bc9a349983ae26890de7ecb5f9552834d47d16adb1b7e3ab1730eec3a950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=jurassic+city+rampage+mod+apk PDF link annotation
    • http://kanchanaspa.com/ckfinder/userfiles/files/pisirisemidev.pdfIn PDF document text
    • http://logicamail.it/draft/media/69286029897.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368fbbbd7e9---94425662437.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6228c281---98884946537.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/vekokesileka.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/7926653007.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132321f79b09---luzawarexot.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/6857966971.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b642d8639d---27039184505.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/sewatifafosupimifima.pdfIn PDF document text
    • http://yuli-china.ru/d/files/kevaxaku.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/40061162531.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32568159579.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/53225068801.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/xavewejuturilanififumamap.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/52805434094.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/siweduboselofibu.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/wojuvuzamixidoradifajedit.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/67897067513.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/20993802899.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/5571933031.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/rivigajet.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/74044898300.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/kiliraximutafori.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/55204485856.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/zafisebedegofisim.pdfIn PDF document text
    • 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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 11004 bytes
SHA-256: 2312a8d7b46efbb6df6563dae9c6f570aab1f7d29d78ca4c9fcc7603d943d383
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 25020 bytes
SHA-256: 6ce9246a5a911d0abf761c1eefb24104ab0b87653f462c693cc907f32913c4fb
font_02_sfnt_off00013e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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