Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b2784874d746e7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 17:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e7035fb3bf677349781e88eb7d5ea2d SHA-1: b522bacc9a1bd6f83261df7891c0b317dfbd6119 SHA-256: 82b2784874d746e761c58acecc433b2df4bf0c9cb31b0b2d7a642ee62b559db1
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including a small file size and a visual appearance suggesting a screenshot. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 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.
  • 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://inwebjor.ru/uplcv?utm_term=mp3+juice+music+downloader+apk PDF link annotation
    • http://kxzyjy.com/CKEdit/upload/files/16537947234.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450dbc2f6dd---89072857838.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/98732951885.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/akeshf6ucgkg8684t91g6i3ci9/pibomovidi.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/11042317401.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/94352833760.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/29246356964.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/30696788271.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/29494298592.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/javemi.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/69894401622.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/wajopotodinefujoje.pdfIn PDF document text
    • http://minhanh.com/files/98723413378.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/409926932.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/91989372086.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b09f33d779---kesev.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/41331438484.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210904071347.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b1d2805285f9bca5b4dcdd2c7d9c1d18/zilegolisopopez.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zonogojelogux.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/53de4e9372b7362abd148d85a623432c/wezuwopitapelijijironox.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/81126564502.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148464805a88---riwajelid.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/41296988037.pdfIn PDF document text
    • http://livestocktool.com/d/files/17897823905.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_off0000b381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 13800 bytes
SHA-256: 77867582cf0b3f015057bd153f0ed84600865bb21fa3b67e1c14817b75de15d3
font_01_sfnt_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 11152 bytes
SHA-256: 5ad6bd72c149519965ba741ece826952305b40204c3111f330ba2164a51bdd02