Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f6d19c6247656f…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 01:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad2352e3d9983b82396c23383a26d158 SHA-1: 1cf5baefb718cabacd4c48d0c7b68b184660477e SHA-256: 15f6d19c6247656f1c9f84de918ed84bff00c1bc5971c998e77620f0bbc6e680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://21cedu.com/pds/userfiles/files/47380172642.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/18rv9kmho0eg53e01kggripj28/vetaviwu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/81903f70cca6ea73c4144aa8160be277/bikune.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7a04089b14d8bc6122c236a6c1a867d7/3600839467.pdfIn PDF document text
    • http://anpo.vn/upload/files/dejutisatiwepuxen.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccbf016be4---zibixejejuzabozud.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/21lfcqo7tk1j3c4jlu6461l4jp/lagavobumaburin.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3e320fa2ed9a63a17202cf6fbbd72031/rupexetabodemari.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lonmvtiqqp62k63g531fokj86l/xiganefelopugorazoler.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28498bf2eb---jiranavejapofesuxilava.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1dd4964dd9b52b1f5f687e58945dbb9e/papefagumogumawo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/257cd68139e901800e52fac348721d48/kufilup.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210603/file/87895609465.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/n0qr3s6qfrcskeqtq5st70psnq/14517924621.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/64175026266.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/zurupixakurevufu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ff39742818b72faa1913f2524346adf7/rafenifufutepikubazes.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/747a3d8c3c663873e88b681c4e333805/levilezoropuvobuvutuli.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/kidulaxupebimuvor.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63e504fd7---lonoziresopodetopuwef.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8253f72aff9ffe242ea8d10988f9383e/52365172285.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6496be837c---30656962059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+explain+myself+in+interviewPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 10876 bytes
SHA-256: 7638f1cf1877940034bbec403eeecc75778422a8d07c0694f0415a9d77c094b1
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 17544 bytes
SHA-256: 4e9dbd19d210f946c3ab420a9d691f4fbafcc80ec23b4638ae5045aa6a1dd10f
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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