Malicious PDF — malware analysis report

Static analysis result for SHA-256 7610ba4565b2d433…

MALICIOUS

PDF

79.6 KB Created: 2021-06-17 17:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 410df78868229b0b0161911e25879bff SHA-1: 314917f5b7dc45dbfaae4c788f531559c86b6ed4 SHA-256: 7610ba4565b2d4338a3390ac3f75bb436163cb240187a434485df48c2b0d54a3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains multiple heuristics indicating social engineering and malicious intent, including a 'ClickFix' lure and a password-protected archive hint. The embedded URLs, particularly those hosted on compromised CMS uploads, suggest the document is part of a phishing campaign designed to trick users into downloading malware disguised as a legitimate file. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://ivanda-commerce.hr/userfiles/file/98234716464.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2621adf9cd---93678592615.pdf
    • https://raiporjai.com/piceditor/file/82306025540.pdf
    • https://autotrans911.com/thread/admin/uploads/file/14179668234.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bvmj42trh51p0vvc52kjqr5m63/78055634047.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c87cd84e---vefuvuza.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8d1154fd---21185269915.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f8c0bf57---xojedenu.pdf
    • http://rajskiewakacje.pl/userfiles/file/52946384039.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f277bcd4e0---raloxewegujolog.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/ac7699f15238d7f1fc0e8ae573680026/86410593560.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/6ce3d1402479ea32f528b344aebba2a5/92056145534.pdf
    • http://ahcxdq.com/uploads/file/021146064033.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/65f1735c489ad2b38c35fa0b48c56ec2/dikomuvemumawomogobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+iso+windows+vista+32+bit
    • 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_off0000ed22.bin
45dfb5d5a12f3530af47015c82d2f98c8e707d0e103d522eeae386dc1f8c3997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 5308 bytes
font_01_sfnt_off0000ff61.bin
90b58a80754210dd6aee42e43f52a9b2128abf6b4a5ff372d22813464f30ed62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 21464 bytes

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