Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3632c9b5631e63…

MALICIOUS

PDF

81.9 KB Created: 2021-08-16 20:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2e6f989c7173ab398809c964c798a9df SHA-1: 1d121fe058ed11a3ce3bb4af5e2620359956ebda SHA-256: 9e3632c9b5631e6397f4696afb4e2ed02a090fe7f29cc013e2b7c148f54c530d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to facilitate the download of further malicious payloads. The presence of external URIs and link farm heuristics strongly suggests an attempt to deceive users into visiting malicious sites under the guise of software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/u381ucqrlhub7sl15jn6g3crsj/96645938757.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be176cef46a---58356941411.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160988cfe0fc06---lilosexamezodalunewi.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/risisubekifobi.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/purajipepelorewuni.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/600927a1154b565cabc2e1360ec781df/zelagepunilafidabinu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/26681d564161a6ddf47c7b2b93d6b5fb/rapakutopeduwapewi.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fd1f9e8df95e2e986f2e263743d1541f/32351957223.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e314416137---sanelasofotef.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/94297588867.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/21502859430.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1f48936d---5820194627.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/90390132764.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e9006d941---wukiluxiroduroz.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/binezowag.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/tizevewodifalijidutilew.pdfIn PDF document text
    • http://usateatop.com/_upload/files/39824434598.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/1191c86e619d230913200c78cd9169bc/12088335893.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac140c33e3---duginadogorox.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd6121e4b---84981475538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=java+free+download+for+windows+7+32+bit+full+version+filehippoPDF 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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 18044 bytes
SHA-256: a3aa28500b029f126919a3e70ccd1e33724dc4b92d932b73ff79561249ac470e
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 11320 bytes
SHA-256: 1f71afde011b1cb839140bb6fdeddeb74d51872d54d97749b4707ed1f4eb52ad
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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