Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb9aa832d78a828…

MALICIOUS

PDF

76.5 KB Created: 2021-09-25 13:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 956b3c4a8f0bb63886e68b3619eb8866 SHA-1: ae50076e1a98422101e485e28003748a87c10870 SHA-256: deb9aa832d78a82822b42d73a00748dfb955d52fea658a67b675e6b17a3bf6bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=how+to+change+your+android+emoji+to+ios+emoji PDF link annotation
    • http://railwaysrailroads.com/upload_files/files/54408849300.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/ruralunigorupuwanax.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/vunewigolupemaribibut.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/nebusivil.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/75609889277.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/xivijezow.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/eeb598f397e9b2de09a84e0c9f3b0315/gekul.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/15483785053.pdfIn PDF document text
    • http://all-premium.com/user_file/files/911122232.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/94393830804.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/25395594230.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/69541164292.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb644873f---76131806500.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/70181547677.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/53879533947.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/10322479560.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lewesufutesusikub.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/rurekudixezonawa.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/dagufaboravomorisebaxobur.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/70815565128.pdfIn PDF document text
    • http://dentherapia.hu/files/file/rajadolabibadozutozuv.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/11800739739.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e28b2ab16---vilufizigunuze.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_off0000c21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 18792 bytes
SHA-256: c2642392aa4b5a234ef0ff3bd3533d8c2a0b85866f7a86ab6174354e5734bb1f
font_02_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 11192 bytes
SHA-256: 406ff97792bdc9d73cf550a5db804dc41de04cf2acf63ce326af05e6d5dcbf56