Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b524a256faab32…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 09:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 394d23a28c36cb0544513f7577a9dd6e SHA-1: 34b82d07237c84723d7a0b90c5099e189dc3a67d SHA-256: 96b524a256faab327509cc0252e7f1937732be8b99e74bcc37aec9a1b714b461
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, suggest an attempt to redirect users to malicious content, likely a phishing lure or a download for further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://chcial.ru/uplcv?utm_term=adobe+pdf+reader+download+for+windows+8.1+64+bit PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c7b3bf8e9fa3e8cbd295563d25fff54c/japujoderiwikanamu.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/lixikomenizabage.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/58083658436.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/99483508024.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/edf8f9504924b925a5e1027543aa2c9d/26967740212.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/babadidigidirunarewuvij.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/34910207981.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b305c3b6741---wewibamanivalebarike.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa7c901a9---18663988247.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fcaa6ecf8---74032615394.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/nibad.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/papusajosomevaguvakates.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7ec104570---xulopugoneravaguz.pdfIn PDF document text
    • http://dakmet.pl/upload/34520591291.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/8470752071.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/10916906682.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/vesesorifodav.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/betoxowubajuv.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7f539540---51810435767.pdfIn PDF document text
    • http://metallpress.info/files/rozikatomujeto.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8bbc8a599b4239336995eae0205052f/resosavifaku.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/muvinurozitiwe.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5e082644ba5d7111f0062ea6c5c401af/gerafupejasisufewekade.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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 11272 bytes
SHA-256: 25b818b3b49f457c83b922c04860aa316d4d21c72728cd6c24eafedb20357063
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 18424 bytes
SHA-256: 4f9a9d649370c960f0678e42a23607f78c413312a06990f1af6d442995fcaa9a
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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