Malicious PDF — malware analysis report

Static analysis result for SHA-256 de32dcf8a9b5dbeb…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 01:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3619861d9671ed198b9fc73b04a29fb SHA-1: 202f55474c8a6616fad803ccba6e935909cb1620 SHA-256: de32dcf8a9b5dbebdc1101b59e0231942e765ed27a010c193e31e64cd31f4e64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to external sites. The presence of embedded JavaScript and multiple links to potentially compromised or disposable hosting services, as flagged by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, strongly suggests malicious intent. The ML classifier and ClamAV detection further corroborate its malicious nature, indicating it likely serves as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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://webinaris.training/ckfinder/userfiles/publics/files/26476697664.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b5282f2---xujibesafujanekole.pdfIn PDF document text
    • https://33mobility.net/uploads/files/3290633506.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8ece55d1---13555021419.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/bujorowitegi.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/31241401172.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/82040410045.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/80660902518.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/67805879969.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/vomobijokivuvavexe.pdfIn PDF document text
    • http://stromzeleny.cz/file/36243200256.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a75b7f1ca---lefepukaxudusebewekaji.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/muralusazuv.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/xorozixubexibebeluxojal.pdfIn PDF document text
    • http://aromata.ru/upload/files/lawanaruw.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/17734722606.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/jewamujoxasawodojijilevov.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/sabuxa.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nitogedetexiwobudir.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/62611795245.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/zugagapejasofo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ladowedivurekuwid.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/63554808968.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jexum.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d500a5bca---numugogof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+sites+for+downloading+games+for+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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 15100 bytes
SHA-256: 5155f77a3ac616b3d9cd2a1a9a0dd91adea43090becbf83558aa5a2bdb9e1dd5
font_01_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10836 bytes
SHA-256: da6c1063c11f79dec92250356f67dc11c13ebbf659360f9d37045a70cf4884d0

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