Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b42e2464962a0c4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 09:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7370850cd13565f4546d1e3531e38682 SHA-1: fc0269c0cc408a67ee0e6676987061a9bc8ced4a SHA-256: 5b42e2464962a0c41e8de8cb0312c41f378726e08374393598bae11adfe150c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the ML detection indicate a high likelihood of malicious intent, possibly involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hunglivet.com/uploads/files/202109061745323025.pdf In PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/suzipamijoruketowut.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mco1up2pqt89678h3ut0u3ia9n/904030897.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/savefedo.pdfIn PDF document text
    • https://buyafranchise.org/files/files/55097068625.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/lujorotugunaf.pdfIn PDF document text
    • http://specimport.by/files/files/negexexapuget.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27ca2b26d---xudovowitoze.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/87375446323.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210905_3C1F07290F472F77.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/99848294001.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/5147545923.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/kulalovubiwamaxirarirak.pdfIn PDF document text
    • http://asvpp.fr/pdf/35001341434.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/24908110452.pdfIn PDF document text
    • https://netlandschool.cl/files/lipasexabokumusesomili.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/napirajalebezatax.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/77905649630.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/4664323853.pdfIn PDF document text
    • http://epicridesnepal.com/files/79308548152.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d948b5ff42---tutorubivudogulisiwixepa.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/74087845662.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/95423940704.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/13081926257.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/40169750532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+are+eukaryotes+and+prokaryotes+differentPDF 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_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 10828 bytes
SHA-256: 4462d1f9b8c3e2c7be7becbfe3f156ff1bf92d50d34f6326ffc41c204803bfa8
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 17320 bytes
SHA-256: 008b302e895ebf0d3a5d43dce00a3547c9bba785fbe9440783e42913e96c98e9
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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