Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc9470f33d42cc6…

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 13:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4088dedb1bf7e3d117ef8091c20c95d7 SHA-1: e177fb76cbfb3a87748d43834fe3e6fd0ce41dd6 SHA-256: 3fc9470f33d42cc6b6742a6c0d2ba6e85f84a1b18b717a44df549cabbd96c9ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and content, despite being heavily obfuscated, suggest it is designed to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=badshaho+full+hd+movie PDF link annotation
    • http://jinsonmetal.com/Upload/file/wekodi.pdfIn PDF document text
    • http://dsfly.com/uploads/files/17176830314.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/milel.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vadabilubiboruxuro.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oa3l0ih5oq42i5bc3shm423efi/93981459734.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/wegubupe.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wubugenipajujovamazo.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/vuvemanojokedetil.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/18949129181.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4b9db9c1---92131053267.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/62279911033.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/82003007703.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/lopetevegotafapuxul.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/lideb.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/padifarewisel.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/xokaropanepimen.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/raratobi.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/xugekofegagisafatejiseta.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143214785f94---votobudi.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/fidizagapo.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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 17228 bytes
SHA-256: 0b5049e8c10cec9172f92992bef3cd174714810b69909dd66cc7dea0f1d9dc46
font_02_sfnt_off000141ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EF 10536 bytes
SHA-256: b7b72398c830e62148095c0b11c7b62dcf5c0de43523761c1448d50ce1b3b55c