Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b929a9e04460dc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 04:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f076585696cddb923bb3430b0768f54 SHA-1: a35d05d468f2bc5a9c1c2d600b59b3e918456707 SHA-256: b4b929a9e04460dc94a3413f44a771f1319d7bc21f4a8d07559b8f0d70898c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 http://forglass.sk/userfiles/file/dewagezaxaf.pdf In PDF document text
    • https://universal4shipping.net/userfiles/file/vulevivagubonewevu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/44268531648.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5l7o5t1ubcsd1hj6kadqo2rg21/49440282679.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/jutozadimavanumewivorakeg.pdfIn PDF document text
    • http://anninh247.info/upload/files/navitob.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/89304983348.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c000f0406---jatudesofaxa.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/75814534213.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/fovijisax.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/33302276988.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/nusuzex.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/pojemipanitalufikuleva.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/doxojolojiwowevawiza.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210907_151116.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210902_CFE3FF18219A778D.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/32750373053.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/94976909222.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ugbcacfv2f1ipuead0vrabv1u/13620019805.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e628fd22919a897720ea4adb2ead5e96/sifido.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/bejirarebedu.pdfIn PDF document text
    • https://membermimpi.com/contents/files/51256121150.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/89037995749.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/ferubakojupenefuv.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/11467907975.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/63302912749.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/26659647296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+debug+bridge+ubuntuPDF 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_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10268 bytes
SHA-256: 874723dfae10c8c0701d117c87445b971859edd4a9b47c0f8b0ad56fb104d67f
font_02_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 17460 bytes
SHA-256: 179e98ef78cb39104ec317c7bd6c8a80dbced03072e818a9a51fa0fba4b29447

Open this report in the interactive analyzer, or submit your own file for analysis.