Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a890aa74965030…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 01:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1971a5de772a57dc1ace8c065c258fb SHA-1: 9952d1e49f8e218e289aaec3d2b9ea07162d8717 SHA-256: b0a890aa749650303c87e1b4f8fce0ceb1add635746a3294232aff39b6ce6b59
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which point to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://klubbelgickychobrov.sk/editor_uploads/files/tawovoju.pdf In PDF document text
    • http://seksdagen.nl/userfiles/file/10256540525.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/65149718984.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133661a4fa7c---guzivono.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/31314429326.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/vukaxamowok.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/vonuduxanazibekeb.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/kisoviro.pdfIn PDF document text
    • https://shibbirs.com/media/files/javuzufazatekopewu.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/selonuzego.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109060659043312.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kajatemixe.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137671298dd5---zurofotekuzux.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/nafamevagenasisulurape.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/wubesofefajud.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/vasoruxibarukekirivubuwoj.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/sapoloki.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6bdfc03842f54bd048b9bba5601e925b/65110926063.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/807ef18a85aa96b265a0a69e298f4022/vufakarat.pdfIn PDF document text
    • http://specialcats.nl/media/files/zoselisagabesumipudar.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/80872515782.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/bajanexobimowewuki.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161313f8d97019---soxonorefukasowirutoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=different+colors+of+visible+lightPDF link annotation
    • 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 10660 bytes
SHA-256: 982e78d7e891f867d47ec18d5545aba5d3079415391176670f58ad79f227f32e
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 17712 bytes
SHA-256: 603b8898615b63374dc7c81931cb6acd1a0a75c493648622ead82340103a68bc

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