Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56090f59bb56c79…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 04:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8144f4f7ace67299ddd33fd55392a08e SHA-1: 3e18035fde7e712f080d95e0697d5d02cfd4e56f SHA-256: f56090f59bb56c793fde553f2b3f13e8b07e56c0a12ad18e49f8d6cdf37bbfe4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, including those hosted on compromised CMS uploads and disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=how+to+turn+a+video+into+a+gif+android PDF link annotation
    • http://jiji.pgo.tw/pic/uploads/files/67566724800.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/sinimu.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78686253444.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348f18cb8d9---tubanudafifavilimen.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c7cd132a---16375869531.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/41314129054.pdfIn PDF document text
    • https://peterdegendt.be/file/nejolofegesem.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/84297927555.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161320be2c57e2---79086005573.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/razuvitulukojapedobamuj.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630894588.pdfIn PDF document text
    • http://uteambio.com/upload/files/14662286694.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/fexibasosotufekusoroviwe.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/58941503099.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f967706f57---belisabutuloluf.pdfIn PDF document text
    • http://nemochem.cn/upload/files/putugodamibobizizifarino.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/38022411107.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bawurijejuwoxuzaperol.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/72436062209.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/95917678931.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/kawepizezeluzatamexib.pdfIn PDF document text
    • http://belst.by/upload/file/36916781520.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/5751021533.pdfIn PDF document text
    • http://etkenkalip.com/files/54504961206.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_off0000b7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 10560 bytes
SHA-256: 4a1c2c3dc8ba1ba97df19e77849d080d7cee63cf2b93d5af3d7aaccc89f0e37e
font_02_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 15660 bytes
SHA-256: 6eb61224e9a5d7675be98c98a2da0393bc23941232d4c728e9c9c58b8dd20078

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