Malicious PDF — malware analysis report

Static analysis result for SHA-256 3853b2ae4bd61f2e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 10:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c235e7b0f15966c577632d343a284aaf SHA-1: 4e6f1240d6596bb4b32b0e249e10e94d6feadf28 SHA-256: 3853b2ae4bd61f2e0d37245919abc7a5870ca793fa6a3917cf547c3e6bd15f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=android+tv+program PDF link annotation
    • http://medicamarsala.it/userfiles/files/balebono.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levanorenupelolevirujevi.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/21486486104.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/44560036496.pdfIn PDF document text
    • http://med-os.com/user_upload/file/46472263902.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd7e320ff---xuvebubagijogixejuz.pdfIn PDF document text
    • http://acelybio.com/upload/files/mazadakupowoditawekipekon.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6e60bb61d78bbb139368278875bcc80b/85929706832.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/sidopumufonelafunap.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/82075091854.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/bofarugego.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/23367945837.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ede8efac---63139205980.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/36806512872.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/l1sn9kp9bqhi96gnh4ls6fa7kp/liraxoxubopa.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/66742829555.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/kukam.pdfIn PDF document text
    • http://ccadl.com/files/20210913030753.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9f9f20a04883a681ab6f702368830439/11776835180.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/79365219399.pdfIn PDF document text
    • http://newmob.it/userfiles/files/43174594552.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161405b73f2db2---siparivojamebol.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/gogowulebudim.pdfIn PDF document text
    • 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_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 16436 bytes
SHA-256: 3d151438e91aee4a4912b6a703ac2c124b575c8a1bf5ee31c0b6c60b21f6594b
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10436 bytes
SHA-256: b485669c1106ce89d73a1379f402af718af811c19df193a8cf1d8604609220bb
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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