Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e57b402da71204e…

MALICIOUS

PDF

80.9 KB Created: 2021-08-26 00:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26853fdc5b5da7690df5eebd237199c9 SHA-1: 23f4d4271d5bab4a2a47e25b527dfe2c1c43a76a SHA-256: 7e57b402da71204e18bac72c2b27ea554c5791003103e574153bd26eeaa0e5b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bong-dem-long.org/upload/editor/files/98272129515.pdf In PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/texowusezukosa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8vc3vbtf9snpl0kv3eoqrrfv12/99628889806.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31d2a32e4---molomabujo.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/29319669368.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/77798487452.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/n337ofuadrrijqkck3gsaqfob2/45127277000.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bcc623984---ronazuzipedavojakufige.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/3978786732.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/kinisopurulikewofukepil.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0eeb53f2630429784324892e89091ecc/933606162.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/18416097447.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8c4f0add8e0f286dda73a68a1cc14270/62707995586.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/74365257081.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca3d301a6---3579001271.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830d3bebdc---dupofetopiradezivuxase.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/itavv8hr8dnl1a54c37t2s1n87/komovujamuvi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xibagabiduzatonakugaxu.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/44753145589.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/dd8645bd98a16c339cce5a74373078c1/40987008968.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kd2suivnhqt6v4k8en9kdcfum7/mogisejokolulurigi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab49493144d---wusajekezozasozi.pdfIn PDF document text
    • http://aprt1day.ru/file/wozek.pdfIn PDF document text
    • http://jbdclothiers.net/emailer/userfiles/file/vepowobozulurevivusokisun.pdfIn PDF document text
    • http://machin.kr/userData/board/file/82598648619.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nugorewidibosomidokeka.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/gotugonenan.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952674b0956---gifep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lol+free+printable+coloring+pagesPDF 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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10752 bytes
SHA-256: 738cfdb510023612adcaabc04a7a6adbaebc40eaff3acb2c8378905f1c562313
font_02_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 16184 bytes
SHA-256: 28450ad697b35947013b1191bb0a883d3895a5e2d27354508bbc0e442f23da46

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