Malicious PDF — malware analysis report

Static analysis result for SHA-256 92eff5e6bcc807e7…

MALICIOUS

PDF

81.5 KB Created: 2021-08-28 07:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a24426e2e727b5f35d89a15c2c37f1fe SHA-1: 051ccbac5c71474499d6ae757a2c9f69657e9e42 SHA-256: 92eff5e6bcc807e7cd32b30d176cf40a347d22d36042e98dc7e94cfa732bf713
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to execute malicious code or redirect users. The file also exhibits characteristics of a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These factors, combined with a high ML classifier score and ClamAV detection, strongly indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120772c27916---14308880519.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/04ed0d963f03a096d22f4057d8af7857/wajubepi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/35964017848.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/bidod.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6e767556---52817407217.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6669b54da660af936b13801971a5edf8/rixuk.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210819_064210.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/jojizajajikidasopomi.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/43092562979.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f3103d85d---nekepi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a497485ddc---69864020210.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/91984135968.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760dc3da2e5---1654498508.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df47310f3c---94594025068.pdfIn PDF document text
    • http://centromp.it/userfiles/files/29831180044.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3541dea37897f08c34d436d38c0d09a5/sonowajoxadegipizererur.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vuzufakabuzibubekerele.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/70254775740.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/67798614239.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746ae7b6a30---56253041342.pdfIn PDF document text
    • http://boxethai38.comupload/file/somimupepadimiwowukif.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kamiguta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=high+line+reopenPDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 10096 bytes
SHA-256: 6c4e42a4157847097ece3d69ec84175f873f31f9f200645067be2bbe6326bf0b
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 17816 bytes
SHA-256: 7812e102c7ab267c17ac00df847686724389d0d26f718dcd051a8ccf04de52d2
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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