Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe1907fe6d2106f…

MALICIOUS

PDF

90.1 KB Created: 2021-09-20 14:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f38ba061175326a8c4dfe99534ca6c2 SHA-1: d10e8eeaeabf86483285b4d1b44c943a57943d53 SHA-256: dbe1907fe6d2106f78ec8d3e2a6f5cbcb91f410daf4efbca30ebf7e3f10fb1f1
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and a link farm pointing to various domains, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded JavaScript further supports its role as a delivery mechanism for malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=drive+2018+full+movie+online
    • http://zap-interactive.com/uploads/files/32007162641.pdf
    • https://777mto.info/contents/files/47404520300.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142245d33f80---49496715715.pdf
    • https://alhurwallpaper.com/Files/files/52274959776.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/lobiduwuxevumanomaxipa.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/migikuxajagetoveliwo.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/10048961597.pdf
    • http://spielundlicht.de/content_provider/documents/files/78970334247.pdf
    • http://banner-ever.com/ckImg/files/velawuponusijeta.pdf
    • http://gaudi.tw/upload/file/68514834230.pdf
    • http://esangsok.com/upfile/files/74761156857.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/fekozapi.pdf
    • https://www.mds-horizons.com/upload/files/wowebifijolikun.pdf
    • http://mcutech.net/files/godulaxokidev.pdf
    • http://zit-tech.com/userfiles/files/dipitezunerufokasugibo.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/794aa1f2be8d86f34a66355726879dc0/23091158161.pdf
    • http://brenno-tojestto.pl/userfiles/file/lobopi.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b9fa91aa41aa17ee78b33713c286a8c1/lutebukagagipakewifobovat.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210916_072723.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73376302300.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/65477687146.pdf
    • https://pbpkrosno.com/fckfile/kisakawizusigunuv.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/81324589082.pdf
    • http://francescasciortino.it/userfiles/files/zewalovozazofe.pdf
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/purerububanududovomunugam.pdf
    • http://sbriz.ru/userfiles/file/gijaxejadosuj.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_off0000f7ba.bin
02a92bfdbe6610b1e48f106080985802baa43a2156d747087f5b9a1b4821367d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 18780 bytes
font_01_sfnt_off00012873.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 16792 bytes
font_02_sfnt_off0001408a.bin
f1fe103c90d52715ed98627738d67b1077bec321c39544e71a79d1d81e65ce5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408A 10616 bytes