Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c6be165b6dcb17…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 04:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2c8c7b52df5c00e3b12b916bf3d750c SHA-1: 5ac716e931146f76430ccf5730034e4571220c55 SHA-256: a4c6be165b6dcb17ada98a15fd3b9c8c8ee0592183631c18db24ee8ace25c2a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=among+us+fan+games+online PDF link annotation
    • http://hangtatmj.com/userfiles/ludorelufegapajilaxe.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/dujoxegetoripavoxex.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gadejup.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/wuforalabidima.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/98028403709.pdfIn PDF document text
    • http://zl369.net/userfiles/file/63444692361.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4fca132fa00b6c638165d8131f45903c/vaxefazizutafatavofu.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/20903860637.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614690b9c5a0f---ribomami.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/zewawika.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/dolonubowemagaziduduwag.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/59463865928.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/54920100762.pdfIn PDF document text
    • https://ms1oke.com/contents/files/daxoxogubuseda.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/kagubumafamukutur.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tolefeveferuretoxiz.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/62305752753.pdfIn PDF document text
    • http://dfanchem.com/upload/files/rabufojag.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/xujevotowev.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/feburemod.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309b55789a0---9553087045.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/gidowekizigigenalu.pdfIn PDF document text
    • https://computerzone.pk/file/40298208016.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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 17468 bytes
SHA-256: 768e531561d43c11d19e20f005243e502cae16fa0fb8bd70f07f37e4d5aa4322
font_02_sfnt_off0001241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 10440 bytes
SHA-256: d34816c12310b37a7fa10f7290a938d340d48f531ec9253e463e65f0a717ada6