Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c3f64aeddfbe89…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 08:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cac0d9860efdff8d725a7fb8349e5cf SHA-1: a5bf71448eed1134fcd7ca60db03917bc21d87d5 SHA-256: e4c3f64aeddfbe89a3d60a7bb3e2ed047e5eadbe397705db2228d13223b63520
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://puntodeplacer.com/userfiles/file/bomidunodizagovu.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614453cce880f---3997458542.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pudarokujaxudofo.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/91707299709.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/74114661054.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/93862472021.pdfIn PDF document text
    • https://avela.md/userfiles/file/30595730114.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/50h2p5oprecng3u22mdqrdvi73/joluvusuwi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614192c2c0f85---wimejosevowomifavekaril.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd12aa4b7f---61195415955.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/fowapipiritexonerupilo.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/gafofisivufifonak.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614637679b3c0---wesoxofu.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/basitatemonotamivobev.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/84340823054.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/navojilawugogajinifutege.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/kugamizirivafaxulu.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/98749852305.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wuzoxesoxalokofesorolor.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/84034518625.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/zazozimed.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/69400645513.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/fezovopofizog.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210906075338220429kuvgmg.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/26775403499.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/41713188685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sapne+sajan+ke+mp3+song+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC075 17320 bytes
SHA-256: 06c111d8cabaaa119f6af5b9814bcb5271f5b5fca829c33b66e38a8518622bf1
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 11000 bytes
SHA-256: 88967f256fe27f4ac5c4ea3eb4e2f6f2c27631fa80442c4c15a305dfef7889c4
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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