Malicious PDF — malware analysis report

Static analysis result for SHA-256 997fd9aad532cb9b…

MALICIOUS

PDF

89.9 KB Created: 2021-07-27 18:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98882c350d2a1bfa31318cff286b50b2 SHA-1: f8c80b66284e9b5175e6d2c5db5ea7a1f66a4e92 SHA-256: 997fd9aad532cb9b3c7ebc82e2574fed05681882296af04db4a198dcecd72e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Multiple heuristics indicate the document is part of a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the true malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/f73io186dvkbekagalb2o6tfur/kexijodulapudukewugaxuji.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f19b513d---barabivizomekilas.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/48645736542.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/wudonibefosizalolezawata.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/24207751623.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/78b8641845dcd8d3b52dbc99fa04e4a2/zatizitowexituxixi.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/8217425358.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/siwibujirakesez.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b0acc7bbf6b191a3bf073966c03817af/87974192241.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/tuniribosoluvur.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/60a07593b38d50d8a80794168b6f0859/bekolazubizoxulanamepi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db15723b1d1---29087198755.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/65226952533.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2a20244b339985f308aab681b0df6bf1/91920486078.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bdbdc412c690ee0f9f7defdf49723f61/xefapurunodixazikupegi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f1459cf4---46835406375.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/6081093114.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/jupukenurozupejutox.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/tevavanuwowu.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/manopudup.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9b049e0cd---zizonekabevas.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/16938698362.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/bupovozeviwusividorugob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=iata+dangerous+goods+regulations+manual+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/458eed3b7dc1f8ef1d48b50d566a8b76/69240326388.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_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10892 bytes
SHA-256: 2e97e20da9bbc19935425a09d6d9896edbba3e2cdd9b5d3d316d67423404b3b2
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 17436 bytes
SHA-256: 16d82cc0bb06e044a365d934c00d7e8218d9b1be4daf8d8b4f3ecd50e166ed8f
font_02_sfnt_off00013f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1