Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69407fff5bb9fd3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 21:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3bc670a04c0eee8149935cc33b847fbb SHA-1: 1c63044d3ca49df501dbfc8c7c9737259900ab50 SHA-256: d69407fff5bb9fd384bf386228120419b77cbe8d1f2f7453c5dd0bdeae32c9b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and a large number of links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://nomylo.ru/uplcv?utm_term=best+free+games+to+play+on+phone PDF link annotation
    • http://technoauto.jp/js/upload/files/kofirabufop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef9ee6763---78090885632.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-29/20210929004515188107.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/badodazokifaxozo.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/34567926546.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c16e5af287---34193811948.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147755c7727b---xotalu.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/dibopewovafu.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/32939277401.pdfIn PDF document text
    • http://sivam.pl/files/file/moluzifa.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/zajowafufunidazamavebi.pdfIn PDF document text
    • https://materiale-parchet.ro/fisiere/file/vojebesufujiperulikasuj.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gukotabujupakuxuzoj.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/12836171061.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210912175834.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/pakufavalemekaxuba.pdfIn PDF document text
    • http://jarosi.hu/files/file/49566937942.pdfIn PDF document text
    • http://rnralpha.cz/res/file/xikalivixarewogefebanebup.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/85605096463.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210930200556.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/51919189377.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/bidexirorakalove.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/33084762793.pdfIn PDF document text
    • https://t2sc.me/userfiles/28502682751.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/454b32c39c1d2f5553e4f7375252779b/4219485067.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/27392754980.pdfIn PDF document text
    • http://mopron.ru/upload/files/nejewes.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_off0000b618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB618 10880 bytes
SHA-256: 856d10479066c97db8dfb4818f253de70a40d1fa23814b9554b99e4621ee1a37
font_01_sfnt_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 15612 bytes
SHA-256: 49e8eb33c2c854e4a9757c3e99236798e907d653dfcaff51ee6b03e3db2a3c6b
font_02_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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