Malicious PDF — malware analysis report

Static analysis result for SHA-256 077892a3ca51efb9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 07:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd2839abcf4272c5d5b891ed96736f60 SHA-1: 76abe6fcf5c51f4d4ba6f5a55cab778a9134c7bf SHA-256: 077892a3ca51efb92e5ec14c24b3cdf75690a650709b9bd95b0ceaf496fc9bb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, some of which are associated with compromised WordPress uploads or disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across various domains. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dafelia.com/files/44613534048.pdf In PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/rinijemodegomimunoru.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161393259e250c---jegozop.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/17642426227.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/79712640523.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/palipokoreviditagosokowi.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/dekemitibunet.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/dukoxoziwevafojaba.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/luzapekufatuneviwinajit.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/vomakekamimizupujevajud.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-01-20-33-40-bWbzKZHY.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/wiredonuwas.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/vawonuraba.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rujafozusipikavuxem.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/boxuwi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kesunuteza.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/vodavotovexubigoge.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613992182bb09---tovujudasepuvifinurol.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/susogujujajibuwavibov.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ud65fomg1n7gst3i8qoffrkep1/dirafisiban.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/kuzunewivuviti.pdfIn PDF document text
    • http://idroter.org/userfiles/files/70239294672.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hucja1a9bld5vdilfjqta9qmb5/fewurunasewolomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=subway+surf+in+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_off0000be89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 20628 bytes
SHA-256: 70906bd2fbe9eae38ec88f7b23c7e1bb08137b3090d839f614f292f51a838772
font_02_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 10584 bytes
SHA-256: bf3fa1e9b88563639d63e68e775de63d12b6518744c8d68adba5b2cbb71e7ffc

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