Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b183100d32febf…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 22:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3aeb0ffc7f2d369f43605360d10d835 SHA-1: c35d30fd6a673f20a471118a02a99a72c313b18d SHA-256: e0b183100d32febfa80192f36aada6478612fffce1c804139eef0f3735df89c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are designed to lead the user to download further malicious content, likely another PDF or executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cyklo-wellness-penzion-palice.cz/content/71655750576.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b95edbcd---26610662746.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vupakutexunuwiwezedo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8aeada10b8be34f1ee06893bdaf2e14e/sunugi.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109071808013958.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/tobel.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/34564334184.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/71313184717.pdfIn PDF document text
    • https://atavio.ru/files/file/97397587554.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/lujopuk.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/rafurekexisumedu.pdfIn PDF document text
    • http://wohingltd.com/userfiles/49776697371.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/355555433.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95a25b461---kudonisolitaluzamid.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/84010099733.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/9642627046.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210907021834.pdfIn PDF document text
    • http://seamacros.com/upload/file/lugativezamawokagulujidep.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/32779922317.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zazarajapufidibaju.pdfIn PDF document text
    • https://campermagazine.tv/public/file/49861713693.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/95695031087.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901102649181107.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/supipavumoruxu.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9981161457.pdfIn PDF document text
    • http://vititanon.com/user_img/files/finakus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+background+image+in+android+programmaticallyPDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 17664 bytes
SHA-256: 91d17cf7e8dfce0f3d1d7014c71a7baaf89335fa180f64913f57d0045d8fb837
font_02_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 11380 bytes
SHA-256: 4ef71adbdd54d516ff787a52a136dc74a4a7a65c7d530264dba25ef94ea8045b

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