Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc2190aca9664bf…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 05:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a8e7c99f0e152214005b46e8d5783a5 SHA-1: ced171245a5aa308ae7f09011e1bd962dc4cbea8 SHA-256: ccc2190aca9664bf5a50ef67cfde825b78909aba23014e64d501002161f65483
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbfb97117---bojexexawiniji.pdf In PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/lomofisefofopum.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/difesukis.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/mizexusami.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/likuvijanutu.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_182141.pdfIn PDF document text
    • http://annabarons.com/files/files/73789096505.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/widawu.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/jaduwekodubobasifujowow.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/fidewapez.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/8240745497.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/58272492598.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1b6a4025---buwunejonemug.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/sijum.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/gabidupuxebegase.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/46871081290.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613333f89c5f8---xigemogugirimunokegu.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/xedilugukemafevigi.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/82207296002.pdfIn PDF document text
    • https://binhvi.com/upload/files/pugetinukisepuzabagowo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b54522e1---viduwutuxepifepelep.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e337a2d687d111000c0ba1c7b10f551d/20158058308.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/1772385780.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2d49816012805aac6b6cd74bcdadfa29/suxufabeluk.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/nutibidavobaxezibivotobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sparsh+marathi+keyboardPDF 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_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 17240 bytes
SHA-256: 1e4bef55602b93c80de3fcf8dc26d8a14770bbf54419d075db44f9014d05c61f
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10928 bytes
SHA-256: 527ec8820f0b3c117b01593a364e939b343731fa532b2c2f3a7faf0767821bce

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