Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df83dbcfabb3e80…

MALICIOUS

PDF

87.6 KB Created: 2021-09-08 01:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0e9fa3256cc3e3b89bcd3f1f2aa7d546 SHA-1: 0da5e49da1499b8c61a64ad2ab4057c4f415aad2 SHA-256: 7df83dbcfabb3e80e4f7497fb3400c1633d0272679638551fd352fd868774550
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and potentially a callback phishing lure. The embedded URLs suggest an attempt to redirect the user to malicious or compromised sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chongtham68.com/app/webroot/uploads/files/xofoduj.pdf In PDF document text
    • https://bestofbucerias.com/upload/file/11282159928.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mesadel.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/66d4f67a7a64ff5eb36f0eefafce32e4/60823927064.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/50v591r0gg9de61dv5rfh185jl/xosonajofulujetosupef.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/25503394305.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff942375c---pediwevagobididexuxili.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c19dad194c0ebef7131f8fcdbe4e5e51/86564561821.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/866db505a7c82104c21c3d61696a5f46/jedam.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/vevosupibukizopuge.pdfIn PDF document text
    • https://qkon.ca/images/file/muziboxo.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/67870533633.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5da602b8506a37d70c4c364b7047963a/1368459054.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e5ea5b17---36323860060.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/28598325700.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jemaxofeje.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077124d469c3---97435046460.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/gonibuk.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/60617254044.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/webonigef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=causes+and+effects+of+indiscipline+in+schools+%28pdf%29PDF 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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 18608 bytes
SHA-256: 4ce1823d3643e9437b0edf6c6d41eab234a502cc2d3e888c9a0e7738d7bda674
font_01_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10904 bytes
SHA-256: 5f30b463eb6243498ba375f9fa389715d32efd1b3b7c858a43081b81db38096e
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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