Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12fab740dd97ef7…

MALICIOUS

PDF

70.2 KB Created: 2021-10-18 08:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 062429912c102cf79a5e7a918d70f7b5 SHA-1: bfa50563d35ec99d8f6e13757866be9b4e7cedfd SHA-256: a12fab740dd97ef7a25059c58aee260d3f6fe6d04831de7443bd58603e893c97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://pistant.ru/uplcv?utm_term=knock+your+socks+off+answers PDF link annotation
    • http://botosani.ro/img/uploads/file/tizom.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/supod.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/64793732704.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159f43652965---pubadagivoviwudulesez.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/nuridadelu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161445f5a2036a---mipivekesov.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/nujeresaw.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/53684099159.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sipabinaterovan.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/23309427675.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/76461982661.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/34521659066.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/riwij.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/17349672554.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/zewek.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/fusori.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/8777654714.pdfIn PDF document text
    • http://4yoga.by/pics/files/2187768750.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/6373697957.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/62084897673.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/nezujimixir.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/xesisasopatufebijeve.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/piwumefexidewesimomo.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/nagivase.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/wetazekaxebuxubuxupid.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021101231787760.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/bf75873f5da6f4f7e76f22b40e6c6735/zosojozixajov.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_off0000b764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB764 14372 bytes
SHA-256: 463cffed716facc259879d673e9be35875aff0c94b8e19710055bf5d9263bcc9
font_01_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 10476 bytes
SHA-256: bf24e2fa81a53dd6dd42f1479efe1f1a7204071c999310cab098196127185d71
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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