Malicious PDF — malware analysis report

Static analysis result for SHA-256 9674274b634546a7…

MALICIOUS

PDF

84.3 KB Created: 2021-08-30 17:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aa3a79247bcca16807a4531e556ac61 SHA-1: a1dadb4e5fe86a4109f2a485d9bbe37232b0c67c SHA-256: 9674274b634546a7346fdc469d7b23ec8ed7c98289e8922a012cb2d87fa9f8eb
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous links pointing to external resources. Several heuristics indicate that these links form a link farm, with many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect the user to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yodishit.com/uploads/userfiles/file/25823916483.pdf
    • http://montgomery71.com/clients/34132/File/zenezaraxuritugoluje.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d9be6dtpun9di6fvnlq6scs1b4/23901132967.pdf
    • http://jedwines.com/cmsCart//upload/file/43873238183.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3d4b8988---pawevewozikorowisag.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/40811376447.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8303bf836---55788018031.pdf
    • http://circolonauticofavignana.it/userfiles/files/jaseg.pdf
    • https://promobryansk.ru/userfiles/files/loxab.pdf
    • https://mps-india.com/userfiles/files/gemijotelo.pdf
    • http://kunjipsc.com/uploads/files/12274746508.pdf
    • http://kme-kme.cz/files/file/ramagekufiwidizedub.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/24163934972.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/38115817222.pdf
    • http://jinistudy.com/_UploadFile/Images/file/2183075588.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be53e52ba3d---98410122757.pdf
    • http://kraski-chernila.ru/resources/file/15586321096.pdf
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pepilofiberuxozerebip.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e769c122---kazabagewof.pdf
    • http://dailymaydemtien.com/userfiles/files/16677365552.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160708f546bc1c---4229965939.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/levuzaduzazobizidiga.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gezodagisul.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794929b870e---wowasifivifibagogefi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=signs+of+tonsillitis+in+toddlers
    • 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_off0000e6ea.bin
8d27e79005365cec83a831b681f550c0154a7be4880a7a173d63b39a6342638e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10444 bytes
font_01_sfnt_off0000fe73.bin
c3a4b9e8b9f77c0c5963590a3640266ab3fc4edf9b8958540c79d7374c5c10a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 17540 bytes
font_02_sfnt_off00012b0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 16792 bytes