Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f989eed82d766c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 02:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68de2c70e854026e51fecc46388c94c7 SHA-1: 85e28e168700cf01318c0bd0676be134490eb447 SHA-256: 39f989eed82d766cb05d60c76471eb859190050a766e3f30fe98f72431e026a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lmleadmanagement.com/userfiles/files/85693144138.pdf In PDF document text
    • https://verredistri.fr/xmedia/file/ridezenejukixadipagapi.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/52806159640.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614521baa5c5e---jirawe.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ruvafa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7a9bd214478733bd1480785eacd4f475/bazozugubamizokinug.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210914131814.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/tejanefikixowiperusikag.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7c4c1daec615e14f5359b0ddc0345361/84557523751.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/dalulezisawuloboxi.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/nobunoxesujakolusul.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9dafce74484535105441cd421ab854d4/fezeveg.pdfIn PDF document text
    • http://soles2walk.cz/data/file/majivedelajakulila.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///xinezegasopomikujejulaz.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobolenofovufiwomaj.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/gulotopezimunixuvodorop.pdfIn PDF document text
    • http://juha.be/_files/file/73087572765.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/borepukidewadanojerexo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lghluiboebheri0utjllr0n8v5/noxibu.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/dudapamis.pdfIn PDF document text
    • http://josquin-capella.de/download/76952876009.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/65813624544.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/69258141170.pdfIn PDF document text
    • https://soechi.net/userfiles/file/laluxufexiwe.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/lodubezujagaj.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/65310090006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=store+games+on+sd+card+androidPDF 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_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 17392 bytes
SHA-256: 349526400bd5e477c7ffe33b839203db07bb8a1683ba57dd8ea49a53c3c73799
font_02_sfnt_off000133f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 10740 bytes
SHA-256: 5e9b1a23698e68016d908e5753f056670b9a05ef3f77b6f8ee6f8531f2a0cdad

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