Malicious PDF — malware analysis report

Static analysis result for SHA-256 f749bb0befeb53d9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 11:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20e20c60670323a2d91790bb9ebb3ab6 SHA-1: 3505d57eeec529ae857f9a7a0fc0b6b44619d863 SHA-256: f749bb0befeb53d9a271efa017d8cb5ad922122358ca40712ceded404dc52f75
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://nycsmindia.org/ckfinder/userfiles/files/pobujirunajudejiwifi.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf0d4d58e---tosomavof.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/47264610156.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f6e527c8464589838f8b56aec2442cda/mojotunatuzawolezemarapo.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/19504989634.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/megumuraxudibelawozumi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403381e2da---revorawi.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/sokawinowulorakine.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/59456757086.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/notugurodogakal.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/44134253505.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/wabusomu.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/34142144052.pdfIn PDF document text
    • http://harlit.com/upfiles/file/jijunalamosidosoxebesone.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/94960348094.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/35249236686.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/sefulilajewixafivadomuv.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wexoxinababuwisefenu.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/45377311614.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/8154040951.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196235438.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/legisowasapikiniburubaje.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/19267542021.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/71417756596.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/rerirakumuzesoniwadudi.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/48006137222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ppsspp+on+ps+vitaPDF 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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 17304 bytes
SHA-256: 261219fb5c2049c4f2b3735bd28a3f78694c95f5cc6fe5c41a23c9501443351c
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 10032 bytes
SHA-256: 8c445f3bff04a9ae0f702436f40164d81cf73fc7180a55f24d1b9bd638853950

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