Malicious PDF — malware analysis report

Static analysis result for SHA-256 46346a1f83ba7af0…

MALICIOUS

PDF

93.7 KB Created: 2021-08-04 00:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9d6dc4e66145f07c5a332ebe76d55a9 SHA-1: edefc85e440c6815c0f83d7d9fb9dacdf1c5e885 SHA-256: 46346a1f83ba7af01a008b2a366c59a4552b5fc65d3e04f85e1470152a5f8bfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079034665828---fupujilarebadugagelarenu.pdf In PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/tarimomijiwo.pdfIn PDF document text
    • https://europartner2.pl/uploads/luxusidibizodur.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/zovibeguvolukulepefebute.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac717dd5e---65344281166.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0213bc04---buromevasif.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/nixepa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/55922713943.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/95937208810.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sanafuzodutefawesowus.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/577944844.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a7a31e5302596f47407b02b75f69fcb3/doguwudumefurofatuxu.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/rowevigowowe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc7e0ca0e---widew.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/929b03882c3b89d7925555e1dffda4f3/78939863014.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/93095769983.pdfIn PDF document text
    • http://goref.ru/files/file/noxakujoxekibexo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3b000e6287799b70b37f13e84c9c7625/gutedeniropalom.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vupobekazigamotojutibup.pdfIn PDF document text
    • https://p87.hu/files/70422403911.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/numizorubofojumiwe.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bldhsdupalvc2h3kcc8mqrp9s5/nevoduxazesesu.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/60242527157.pdfIn PDF document text
    • http://shahinrouy.com/files/file/18139894033.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b098f61c84a17cbabd4495601f5dfe75/6433750502.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rp47e9e7j83gctelv0vjm7ev82/8371743863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=where+i+watch+free+movies+online+without+downloadingPDF 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_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16716 bytes
SHA-256: 15010547ad06a26be65b178ecf2a375bef82fc515575ae143f58ad53f066afbb
font_01_sfnt_off0001369d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB4 11168 bytes
SHA-256: 2d2f131a246af39d4bc3dff522946ec11e3d896b637be243aab42ae32bc85d2e

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