Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6269729ca66beb…

MALICIOUS

PDF

90.8 KB Created: 2021-09-19 07:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bbc56572e0f247759e20e97faadfac6 SHA-1: 154c157994218afca90b6a2d1136090270242ff1 SHA-256: ec6269729ca66beb5e69050b847dc465b2d4aea83345614968c3ccf2f756a4e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, it features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3rj3uac6a8kv4kic092g3ku866/76438961146.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614422b17f50c---80417958740.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/9506403606.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/sinafaruzokax.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/57410064603.pdfIn PDF document text
    • https://partnermind.cz/images/files/tuvudugevarekazanire.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/97648359830.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/77439433846.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/54917028377.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210905100612.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/diwavim.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jarepabaxa.pdfIn PDF document text
    • https://naves.cz/res/file/67032836050.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c83nvpi8r2n82f608u7q6okqi0/xefukir.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/nemumarudadu.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/bokowidefajizupagov.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/jowagokuzuvixetu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10b764aa5---ripopawilaragifaridu.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/pixigogufejerenoburu.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/dawifevaroben.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/31557318566.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/getozazexapofiviniwofel.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/91910772687.pdfIn PDF document text
    • http://holzweiss.at/jivikatilazawimimubedav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+music+player+with+visualizerPDF 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_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 17620 bytes
SHA-256: 31a93e47d79d3a0ef070b55d34623fb36eb3a3e856dcbf4ead47067fd70802cc
font_01_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 11188 bytes
SHA-256: 98f75ecdc7c45ee47f58db22ad6745dadb8654e8a2bebe03a964d9fd772c4ee1
font_02_sfnt_off00014326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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