Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b354adadbe9f0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 18:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19f71596ff96a9eb281de28bbd4a4fa3 SHA-1: 3171859bc584ed36f6fb6d51dbda8717f44f0a59 SHA-256: da4b354adadbe9f0c36d99b4458c79d1847c9819788f1170bc57c5027376e7f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML detection and a critical ClamAV detection identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users via a spearphishing attachment to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://rayer.cn/d/files/pujisuzutuboduto.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/43b73266793b5f7170b92dc23d0e4abe/fajubusitiwewigabure.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/rutupajafane.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d07c35db1---jowefidedaditiwuzuzu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c823e3bcdc---39524602313.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c9c01bca615026efc997106fd1e5172f/rifejax.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/83272045353.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607966c86b15d---wurapidopi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952929d01bb---80051472459.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/83345717296.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/fojinedelun.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/linuxezepuwi.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/kudinege.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708c1ce0e69---bularelavakigumutomed.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/19498211948.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160907634aed80---24361669023.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607354b20679c---zegokufiku.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/43839794583.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/tapikuxopukamelaju.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb34773fe9---59412869191.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/rodejid.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/nanapuzedejakarokudi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00a52574c5---11681793064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=disertasi+zina+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b1844011e8a82cc9b8944ba7c8d3a398/80615009441.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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 10388 bytes
SHA-256: 449f92fac91fd5b60df9e53d1d546f3a842ddd7e77cee1f4c82bab65d5580f01
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 18892 bytes
SHA-256: 30a519624a6ff9fba52c2c6bba815513138bf6956e0ce22e34617d36fd08fd44
font_02_sfnt_off00012618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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