Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad50480bfb5dd68…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 16:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e479322046189dd3874799a86ac9cb3 SHA-1: cd1117b7cda9d4915a240941e35ab5f609a4f295 SHA-256: 8ad50480bfb5dd68ef599e9cd96fa5b141cab2e01bc2a937d37ceabb96c4b11e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and employing SEO-related URL parameters, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of disguising the final payload within a password-protected archive, with the password instructions likely embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=configurar+cuenta+de+correo+corporativo+en+android PDF link annotation
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xegeduj.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/geripixagajig.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/54066690502.pdfIn PDF document text
    • http://trovas.com/userimages/popixumowovok.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/jesitokerepasumeka.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272d46a661---30471764362.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/29269052742.pdfIn PDF document text
    • http://fruitsad.pl/images/file/68100915283.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78362877b---penukimeronuvuvep.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133b622a3d3e---vananinimo.pdfIn PDF document text
    • https://theurbanthinktank.com/files/32265520879.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/98857955843.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/58751244719.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/84517111709.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/44728336552.pdfIn PDF document text
    • http://acril.ru/ufiles/files/95242110787.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/ramemijenesevenemaz.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/42655015878.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/rafagipenowafa.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wuvagekojifam.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/kobopawanuxasuka.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139983107e73---savinibesililol.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/tusevozufubavolatere.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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 18560 bytes
SHA-256: e1c2c8d4581885e8031f9466fc093f8584fe8bebed2cab0cd6edaffb9b5c1258
font_01_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 10776 bytes
SHA-256: d58f8dc3a0cde79179783bdaa7a1b7710b6a2ec4a8d26137dec660a4c241b782
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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