Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad9ef91fdb5204f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 04:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40c50800b0dce46444c6b2df7839bb3a SHA-1: f684fa74413fe78bf68e3d8e0f8444603cbe0682 SHA-256: 2ad9ef91fdb5204fc8b6db47337ae615bdea5cdabb098f5059f8859efc14e945
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or download a secondary payload. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=pokemon+game+hack+apk
    • http://st-johnson.com/Uploadfiles/files/xeren.pdf
    • https://e-midas.ro/files/file/fepatidekewolaz.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161471d9726429---86791865431.pdf
    • http://hourinkan.net/js/upload/files/37719942454.pdf
    • https://ceccargiurgiu.ro/userfiles/file/xorixomimesovozolulugi.pdf
    • http://scarpatti.com/files/mamorarepolovutezuzudoso.pdf
    • https://songhongresort.com/img/files/nirefitotadoso.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145bdb9673be---watamulibikabosited.pdf
    • http://artsar.pl/userfiles/file/46402902241.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/kivasipilanabogelefa.pdf
    • https://profm.hu/files/file/ninusijapuxunovujuvifin.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/70117168033.pdf
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/betaxaxafutopit.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///73061964147.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/birunepisuxubaza.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/80f065ef643a7af076f96a12dc6de184/46533422009.pdf
    • http://sjhtractor.com/d/files/jokudiwup.pdf
    • http://enotecagaribaldi.it/userfiles/files/19759015907.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1615125f95fb7c---55977786593.pdf
    • http://pazzo.jp/js/upload/files/zirezigiburawisug.pdf
    • http://samarthservice.com/userfiles/file/72185245612.pdf
    • https://poojaindiangrill.com/nbloom/fckuploads/file/nabapajusidu.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/53506291770.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b296.bin
79c12125e728ced78058b47fbbfd080541b387eed36c2898b0b522dfc195593d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 14656 bytes
font_01_sfnt_off0000d77b.bin
8bfcd0c8ea1471c7516a9f0c721ecc5e2e9322a51b7a40768a723291f492262a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10408 bytes
font_02_sfnt_off0000eee1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 16792 bytes