Malicious PDF — malware analysis report

Static analysis result for SHA-256 76871e7e3f28cae7…

MALICIOUS

PDF

72.8 KB Created: 2021-06-12 18:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a9e2427f626700149ba31df23397e0e SHA-1: 669963e51f30d656408d9d76b80e1edf3fff0b59 SHA-256: 76871e7e3f28cae7cf5e04e1f5317053714be5e0d954ba79758fe4e08a287958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://philabc.ru/uplcv?utm_term=kabhi+khushi+kabhie+gham+full+movie+full+hd
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553371c6d2---rewikoginopapun.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5c791ab5---kowotabaramixesixaser.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e3e001f698bb28254a50b38898001f54/wujuw.pdf
    • http://the-bom.kr/upfile/files/72776103850.pdf
    • http://ahcxdq.com/uploads/file/29173754732.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d932d53d7e---51830717242.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a118c3e011---61346595516.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/96921241f6d9000771eed3902cb6668a/sunusajolifafarelixikotin.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4cd9de14a5ce7fc032a22a06de69493a/96823139748.pdf
    • http://atut-biuro.com/uploaded/file/lemuwixozumagileb.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/62e60e43df04aeef8a3cffc018a47a43/gofisotebegirawaf.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc440e5c---28339326869.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcc6239de---46572547863.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2t380n6qnhji0hrhrtreied6n5/buwelazaruguvonosa.pdf
    • http://constantemail.com/userfiles/file/162274090281067887130.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7e.bin
a871af1ebbf5f8f02137d20997d9e1006caf44add89059ae74536479e12b02a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 5456 bytes
font_01_sfnt_off0000dcf1.bin
1e6c4687175544e31298ecb57d209d9c22003bfe7d5fe9cc2dcb396e18a51de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 10612 bytes
font_02_sfnt_off0001015b.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 16036 bytes

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