Malicious PDF — malware analysis report

Static analysis result for SHA-256 6225bdc5fced9d89…

MALICIOUS

PDF

81.6 KB Created: 2021-06-27 06:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7312b6bdca1f60868bc989b5373f684e SHA-1: 9dab1aa1dc6643b92d3c2fcb244703ca79e595a7 SHA-256: 6225bdc5fced9d8912ab725c86d9e0ade66f7749238cae126a8d63ebb9fc7b62
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or utilize vulnerable WordPress plugins, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms strongly suggests the PDF is a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a325755151---44586324007.pdf In PDF document text
    • https://aokman-drive.com/d/files/xubizamufofevalix.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d3c9a4a8---44520930999.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/futiregasupag.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/45785118313.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ddpjl3v60c7pf9nj783to7o9uv/63792700712.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a4fb2ab9bbaca53e347809df4c3c30e9/dibawagalinupoverebojiwo.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/661cb58b8f0dec37f38fc0772b373095/nivizafobezikenajobisu.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/gipokimen.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/35653546346.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160760d1eae928---25135268167.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/78105321356.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/liwakufifosodeso.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a29fa9b2c---65393475328.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1566c2b7---59700917815.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/26/file/52170587837.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vadeto.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rusakud.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2c2b900c64ad10dc37ee9a2647b6c6ac/menari.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98c3c4b35---81956511474.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5b09798e---netizejapezev.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5b627360---11829486492.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b1208034---42171497011.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5fb15382---fakizaxakazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=where+is+the+antecubital+spacePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/233b9d43505874a7be3b244f24dda4ed/zawujez.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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10584 bytes
SHA-256: 77f1b57aaaf7253fd05b18ff3129dbcb98e093c19d10437f6c65001583e4e0e3
font_02_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 18588 bytes
SHA-256: 16ff988666a60e1bf302154105d59193bea006f6b805e457d6faa2832b24b8c0

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