Malicious PDF — malware analysis report

Static analysis result for SHA-256 721703602acd2a51…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 08:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cfa6493904933ed676c5894663b27154 SHA-1: f1c4af34c2d6c4003fa603f084cd58c5ca6e5c90 SHA-256: 721703602acd2a51bb43ea71a2468c51fc386c11c4c7951ecbd357d204691fcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://weiddy.com/uploads/files/202109201552101966.pdf In PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/74521655796.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8abb3b3f4606c7f24e3678d886612576/98564894879.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/wasotujoxudif.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1df10e74433ffab64cb8048f24dc253d/96479074636.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/lutaluvimilogokab.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zefevarapiva.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3e359963b---50062237016.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0e1c902d18ee384b94f0709f9293de3f/busipupudoliromo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210925/file/tuzitu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f1f3663f3---bimusiroburujefiju.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/baxukelumesuwebakiwom.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/lewag.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/pulazakodowaw.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/mamotemanadog.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/68922335089.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/92942581368.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbd02e7779---purag.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/41698207205.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/dibilikelimegagogani.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/23499464382.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/67411614289.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rifaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=master+ludo+game+downloadPDF 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_off0000ae60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE60 10680 bytes
SHA-256: 429d508750721cf036f504c94048ff4b0c6047c74d9f2ee73e81e7dd3385f370
font_01_sfnt_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 15268 bytes
SHA-256: a03d0166b911f6c79b416cca273791710a5a4ee804a0b8f7aff871e3d5137900

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