Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b1737f66ff35f…

MALICIOUS

PDF

86.5 KB Created: 2021-06-19 17:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9f416b9bbad9b4a5d310c3df7c30d168 SHA-1: c1047f778cc9234f3362485e19d11cb33ea7a10a SHA-256: c70b1737f66ff35ff27a73b191ccfe450ba6cff1f917079494e4f7eaa63c3192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c1e4ec33---8212041279.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/2422a410f32defba250802b60d2a6613/kisexiwanilesogobide.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8dc90b417---29608098745.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/gafunas.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607424c1c778b---dagazepodeve.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a970236c808---dawabakesevipodiliwobunum.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b77b68293---kazitoxobejojanewasib.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd23b7e0da9---66347748356.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/duduruti.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/zuramoxagilusavimiku.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074137a665d8---75090283064.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44b5bfd1b---nemopezowupido.pdfIn PDF document text
    • http://siembra.me/uploads/files/zepir.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/8094720290.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082841dbb455---30327272927.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/bujabetifefijar.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fbde75fb834faba6fca49e35dec1230b/nivesirosobadetaxaviguduz.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=janapada+dj+songs+teluguPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d7bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD7BD 12528 bytes
SHA-256: 06e59264dc6b690ada6a2f8157ab7b1f070c00c7ef4e3701a370a115337d9967
font_00_sfnt_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 5096 bytes
SHA-256: a3811575dc6b3c75885e430d4cecdc7c0bb3ff74910382cf5851a26566b937cc
font_02_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 3052 bytes
SHA-256: a2167d5ae3307cd0440a491b1508d46ae745125c6162a7789383172e99f58f57
font_03_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 11452 bytes
SHA-256: 2c597943853be181176315be9693fa773d78e7a1b4e9e5ab27e5fdc0d38ba7ce
font_04_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 19504 bytes
SHA-256: 281cfa9f48373efea02b86f6aef1b025a929ff580b1c59639472d00724cf5d87

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