Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e383ee16c16bb75…

MALICIOUS

PDF

71.5 KB Created: 2021-06-27 11:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 060ee5c598f65d8b3bcba4597ff32308 SHA-1: 8129f20f5cdd707ef4b2511c0afbcbeb2a13d417 SHA-256: 4e383ee16c16bb752a83ac7f8b6331d7d248a629d2d5f7fda537c25fe26ca32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nextgt.eu/uploads/file/tureranekizirefotuneturat.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc24b0cbe---42906060115.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qs7q93peba6n29i2u3di7ou1ef/96492307055.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/wonogitoluxibik.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160866bcf862bf---kogerav.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16073f513c76bd---32690019539.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/tatizuzakimapek.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64d069107---pevodutopedutugazorofebox.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/67277820887.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/wuweluwosupev.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lekefanozok.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/lizovidokaletufisozeju.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/44548951924.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fed9f0c251---jefavubezukivezuwijul.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2qrgnh5itkb2fe7q2ke6of7aq2/63193322132.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vemadopujul.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624639909.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243c694a52---69646334821.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/30121ec6ad5547f6f45d1b73f01a2226/rijokewegadewewenuwiw.pdfIn PDF document text
    • http://elesud.it/img_pagine/file/fololuzusubabirifebirawuw.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gexakeg.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16094a40bb291b---94489652795.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcbcc540b---33269236946.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/44341320317.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f2ae45543---sigojipuwixidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=write+a+review+of+moviePDF 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_off0000ba22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA22 10200 bytes
SHA-256: e03e12ec32095f112d18e38aaed5af1dbde0875f86ddeff94ffa535f57c81b01
font_01_sfnt_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 15336 bytes
SHA-256: 1b519376731f0ed65e884c48988859ae7dc2af29f6ce7c1599fae844a2fb3fa4
font_02_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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