Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27947b7d27fb6fd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 14:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 723969102486245bf1af61869bb42109 SHA-1: a640aa7d4924cf58ccfe4f88f06c18f651e47098 SHA-256: e27947b7d27fb6fd79ca9043828ae3d5b907c65f206a3ad0aef08d349295af47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic firings strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The numerous embedded URLs, many pointing to disposable domains or compromised CMS uploads, suggest a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://youngthisyear.com/ckfinder/userfiles/files/43572600603.pdf In PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/32186633300.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/miwonuluragijokalumo.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/3313820105.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///rasozij.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2210589547.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xuvupereraruvazadupug.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2af3b4f1e34f136349e9fb5af1cabe9a/xewunibemikuniguxunepaj.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/jerunaluzabu.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/jawav.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/94491005071.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/86224097994.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/taralaw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345518eac48---88223742995.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/53575521899.pdfIn PDF document text
    • https://siroyensao.com/upload/files/bemojulap.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/zelatadexejinenaluxavis.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xowukuxero.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614367d8cc8d4---wixulalirexe.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/zobidusexerasarofenutotu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161413f864ef4a---98126023618.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/24725012665.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/paguzoxov.pdfIn PDF document text
    • http://wjcopy.com/upload/files/pikemasoluwosisusenoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+dateien+auf+android+tablet+speichernPDF 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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 10956 bytes
SHA-256: af682d39b0bf257f8e2f9d2d45bdd186160c65ea2e8e13bad738c93e8a1bf0ad
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 18444 bytes
SHA-256: ca2f078bce1f7fb0468126756944f48decf7c7abf03f08f36a10e5c8bb492d79

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