Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a30a81b1a4424a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-20 07:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f34ff564dc93379c3eace6e1a17d36d SHA-1: ba127170236c9ff447b48acd6396ac18c74bb18b SHA-256: 89a30a81b1a4424ae8eb13312a1bd45dfdc60bec0aff00b7e3ac5135d1067fdf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, employing an image-based design with clickable links to external, often compromised, websites. The embedded JavaScript stream and numerous external URIs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=mortal+kombat+11+torrent PDF link annotation
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sifisijigixufe.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b87b7eea3---80674833023.pdfIn PDF document text
    • http://gibisch.org/files/files/17621506854.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021911056182761.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/31033222077.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/11358651307.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/nirelesedobixosi.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/98042118695.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/kusikimo.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/nixepuwimewexuvosejowale.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/61084752041.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ea1d96fdf284de136b4dd22b4c847336/pitam.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2ce85255---xibedolejifu.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/79909933323.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dazizoj.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/jatosov.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/forewubiputaxuveguxisari.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210914_063636.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/5398803221.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151209475835.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/14986359614.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/86752002545.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_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 10288 bytes
SHA-256: ef6625db98c485b44707c06ed70224c3f0de4c0c632625be6808af468e7e663c
font_01_sfnt_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 14440 bytes
SHA-256: 4d9a22131a67ba8ef38c0a81cd21bec144e1a36a7b407e1e0d2b1f28ee1d45ce

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