Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fc0c021de8c9ce…

MALICIOUS

PDF

71.3 KB Created: 2021-10-04 09:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c51072a9c95deaaa3dde7d2b402bc7d1 SHA-1: dc14e5ce8e7921cb9e176349ed83cb291d7b8174 SHA-256: c3fc0c021de8c9ced34893f05362ec9f826c01a4e65ee519f5dbc264e6738a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple PDF-specific heuristics related to URI and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=i+feel+a+burning+sensation+in+my+nose PDF link annotation
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/reforiwejim.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/90938101010.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/4095537995.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/monezadiveripapedir.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vobinomidanoxupizif.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/verobilakavewowip.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156600a5e5db---86195023964.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/66829222511.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/35743851796.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/xusujerovimuzelejijuguk.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/52550530466.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/bujuxevaregenoza.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ba6f015b7e2d6950d34d347d140595b0/mirowadeg.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/lipijadukubu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fadilenirowub.pdfIn PDF document text
    • https://hotelcorona.ro/files/10315653203.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/voselirabizajezegitov.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a57c9c548---91083839704.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddedd2e0f5---91976060006.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vilipipamazogijuteri.pdfIn PDF document text
    • http://grupophi.es/uploads/files/boxokuguwunopon.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7516ff823bb5c951d2452c426e054b2c/70843324503.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2f5apsqoipo0t1kofl9n1k6r7b/96146058734.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/7999456971.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_off0000b497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 10864 bytes
SHA-256: 3aa8e81c24dc63159157b0df2b2257eecae1e20ff1dc9f0c9855964da5689274
font_01_sfnt_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 16412 bytes
SHA-256: e4123cf27aa29f1bcfb4a97fd566f6f64f68f9179d7da5e36003502d3a920d0d
font_02_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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