Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f72c3eb146409fb…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 08:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3779a0039926867bab4b732f4a476987 SHA-1: d6eb9c4486352209ad06cc81f7238c8eac7f83ab SHA-256: 3f72c3eb146409fb04621246023c0a1b9a91caca84f0a4bff084c94b6aca7bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://theemasternetworker.com/ckfinder/userfiles/files/vuges.pdf In PDF document text
    • http://stensoproject.com/userfiles/files/milawoxelifupagezewif.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/bubifubojapazazoxu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614557b5aba3f---daxoderusivomoso.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/nofadejuvuravilumupofijov.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109020206253010.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/xapakigifusosu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/kodorozamigerubemefilof.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/10887876198.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/20961130383.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///89329521360.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210915165323.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/meromavusar.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141947b2eebc---16318394494.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109160518195872.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/suxijonodeb.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/beveseponemove.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd38a634df---xozuvopoj.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/41659293678.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xajefakogawo.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/dizipedak.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bb79d21b1858aaaad9865d12171c95ed/60063879539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+view+xlsx+files+on+android+phonePDF 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_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 18592 bytes
SHA-256: 30abac553c25de7079c609c978ff582db1d770b387cde7cb94103e16dd52c418
font_02_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 10840 bytes
SHA-256: 5672db609256785d21a6f7294223e393fa212c6eb583e43879b26787607039ea

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