Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b577092ef71acde…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 21:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e81884090ce8627df6c67fd5db80133 SHA-1: 47f72c8988b93601ccf2b348c217b0290cfc3e6d SHA-256: 2b577092ef71acdecd9a88e6118c91fb11c925023a68ac0af3856aa1de2b5ad7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.mecateengenharia.com.br/ckfinder/userfiles/files/wobijedejusakiritapabadov.pdf In PDF document text
    • https://dianthusindustrial.com/resimler/files/dazababi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a666e7199---61876479269.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/32081537901.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/51962008624.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/18689976698.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/tetadipowidoseloriwukiza.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/jolasatusomezimo.pdfIn PDF document text
    • http://ladna.pl/user_images/file/29713593593.pdfIn PDF document text
    • http://strandedtattoo.net/file/kovivivunavamom.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/1378168013.pdfIn PDF document text
    • https://scalping.ir/data/files/file/nagexelesovaginu.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/riwesixasonobodevevejo.pdfIn PDF document text
    • http://levotst.com/uploads/files/ropisilil.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/17197187463.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/45695001398.pdfIn PDF document text
    • https://il-gusto.com/images/file/53089872573.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f43385fb9e---30579851167.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fb121ddea0af568f2b71ce6d02048526/vumomaliwufakiwilabos.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/xogufipapipifiv.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/92988561036.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347ce2ed2cd---wanutupamovok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=unique+android+appsPDF 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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 10496 bytes
SHA-256: b2070d1cc00999ad65728a075284a26a4e5a3f002c6e2d98b4321783c8b42a72
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 17392 bytes
SHA-256: a5d9548d35a7ce4af623baec6eecd9bd89ab7a287dd304dc044c54976eac0141
font_02_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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