Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a618dc402190bba…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 13:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 624b74016474c33f322213babe169754 SHA-1: a3074715c20a7df906575f1968d3adc8cf420ff6 SHA-256: 4a618dc402190bbabc4c58752a98e1172690a1e2f686d63ab1d34339e5975771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=download+clean+master+pro+apk PDF link annotation
    • http://moneymaker-gold.de/files/7960160113.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/rozugapikobetafubavoselew.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614583af3f272---98254176008.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tagew.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161310b6f24a59---vofusosepad.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/70815060924.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/gowotixofefas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6037c6da---68831618797.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/36037139233.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/duvorukolixugetetoti.pdfIn PDF document text
    • http://bdsductri.com/upload/files/wodogowexu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a57b9378befb61ecac663075f6ba8e85/59789921830.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/47515719717.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191835258810.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/bepolowewomepuwaworabejoz.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109041812315582.pdfIn PDF document text
    • http://sportyou.fr/ckfinder/userfiles/files/62927014972.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/3989235333.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9f3cc094---togiwijerumomov.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/linawifexukawamowo.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/renijobigarakafekaxisor.pdfIn PDF document text
    • http://slovoveri.org/userfiles/lagodudesegakitadufafov.pdfIn PDF document text
    • http://ux-school.ru/files/files/dujobugakafedawogibom.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nazasurusit.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388a9df3d1---gegaxejalabib.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_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 10760 bytes
SHA-256: 0f9b3c2747f9a82e91ee68dc8abe798bf2d8752d85b6fbee00f1e39126b89c4e
font_02_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 16656 bytes
SHA-256: 8df89af382a47c0674248d325f7885546b8b7c00834547afd913d9d285f43045

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