Malicious PDF — malware analysis report

Static analysis result for SHA-256 976784a5659a3ca6…

MALICIOUS

PDF

87.2 KB Created: 2021-04-30 17:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c30cf9f666cdbf3c48989d7e8e3b232 SHA-1: 36fe7b74f9682e630f80b76c04f667bbb6ad0b79 SHA-256: 976784a5659a3ca67eb530f6a9ec64b75eecb6f015755150f8f6e6221794c849
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads, likely serving as a lure or redirector. While no scripts were extracted, the PDF structure and URL findings suggest it's designed to lead users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4k3vgoh3tk36pp40qb972ea795/gikezojobi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3unbt9kr3ebkgt44ml2mu2ir09/rozerolatedos.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdb96940d---93548438399.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766ba611892---jurokulosemuweji.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee57c6211---zekovobemunesijejixex.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607122156fe18---mogexuvilob.pdf
    • https://aimara-bg.com/userfiles/file/27357518436.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0a2988bd---tudexisowopizu.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608371418dd1a---53742472382.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/94d3984656a1f4ce6c157f4a5ac08eab/43227788883.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90c4a111a---73846041187.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gl03ekggtls99k4oqepckc2ri5/52056696918.pdf
    • http://capmar.eu/userfiles/file/36053228799.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b149668f321e6ca60ed616e35c621d5d/93771369449.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160839937b9917---46236339370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=listening+worksheets+for+preschoolers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011640.bin
ba6b463adce3e3864dc7c4601b8a74618d6917569804c95fbab0907d5855ba29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 5164 bytes
font_01_sfnt_off000127ef.bin
99d1a0debda02bd8f0ecdec62a3ee7e1f7c7d5edfc182dd0bbb093f339dbcad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 11220 bytes

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