Malicious PDF — malware analysis report

Static analysis result for SHA-256 e452ea2d3a486ba0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 10:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2d72ccb3959f860fe17b7edb43f1812 SHA-1: b8ef3539d223e5f7751d03f4ff6174a9f6cd6860 SHA-256: e452ea2d3a486ba04babd16b98ba86f3f8b9182e715db4cdd9947945f31bef43
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs, several of which point to compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious or compromised sites, likely as part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://optimumquestsolutions.com/ckfinder/userfiles/files/kasikufakofepeko.pdf In PDF document text
    • https://curtain.jinware.com/upload/files/duzagetenoxadoke.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/24707209261.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/17539482611.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/navugivin.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/koxuvunazotexerojo.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/nejexideke.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/87868905643.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/tolusifudegu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335851bf5a1---wisofebefixinarakusu.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/31689006658.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/57113557994.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5603f7161b46bdbb00f4d5b0b4f32a54/vurugi.pdfIn PDF document text
    • https://oasis-travel.ro/files/pubeduzajefuwezarana.pdfIn PDF document text
    • http://mq-water.net/upload/92753544789.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109191946465895.pdfIn PDF document text
    • http://elpijisystem.com/file/45531368293.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/tulelarap.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/pusozaxazironeb.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/20398995364.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161401018ae259---godorojomitubexini.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210907062808_1299621685.pdfIn PDF document text
    • https://purefeeling8.com/data/file/berojebodagosivufo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/nenemudezusij.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/gewudadigunixejex.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/kosozakazux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+turn+on+usb+tethering+androidPDF 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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 17356 bytes
SHA-256: 05fee9c4b52b86988ce3bb5b2b82347c37efae334d8716b10654ae0667e19a18
font_01_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 10796 bytes
SHA-256: b7ea8233ce9ae46ba702f506266cafc587ee804e5b6495c26491925f90c6e50d
font_02_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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