Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dcc476c4500786…

MALICIOUS

PDF

114.4 KB Created: 2021-07-26 07:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c8213222ac41ca88841d8f18ded833a SHA-1: a67728d90469f51959dc45913d5736c6497c9e4f SHA-256: 71dcc476c4500786f40cc3981ecdded51331e56678a8eb8d86c3f3890bd5dc6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c7070b702148fce0df36c251fa0d422e/wekulo.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/29795137430.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b612fa406d9---25975901435.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/rurezanokezajokisiputu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb5bb1ad7---lirawubus.pdfIn PDF document text
    • https://jagominum.com/contents//files/905463305.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/63d1c89a81a19778b13ffc47fb748b01/mumimunabajogo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c233f3b9ab7---35020690658.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/80383034605.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fc3ae01e---retuwekewog.pdfIn PDF document text
    • http://cloverdiamond.com/file/majeke.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/nuludovepurenew.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d7db45439f31b163f9cdf318eb3bcd9/99554060157.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/60539933759.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcae6537a1---77035091150.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/fd0a8d8ba1b3cf9a601092dbd6f8fd08/gojix.pdfIn PDF document text
    • http://snsi.jp/image/news_file/gibojefaxawofokimofoga.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kujofufekamagigit.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3394284e17---29472532631.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc55fb03fc---lurajufinot.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8601735e4---89100882445.pdfIn PDF document text
    • http://industrialdevices.in/uploads/406424449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=good+nightbot+commands+to+addPDF 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_off0001599e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599E 18868 bytes
SHA-256: 86be231bd5c44107d4ec619a998c88cda48559fb243d6ddd84b84d5f2afedbc8
font_01_sfnt_off00018be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3FC 10716 bytes
SHA-256: 90844aa19048018df4d7654a98adb9ea19ee4e7a8b4e50eafff09ef8769522e5

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