Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92e73fb5cb0333d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 13:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ed7933bb01bc6cbb5806b7d6dcdbceb SHA-1: 6557efb36f2344928d9dec30e7ec1dc6c2227153 SHA-256: c92e73fb5cb0333dbbdf6c4b35932e84930cf094d217488911facba726716812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. These links are presented in a way that suggests a "docs to pdf converter" or similar utility, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely serving as a dropper for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4cb90236---39727595893.pdf In PDF document text
    • http://sooclose.eu/upload/File/retupebivolizaf.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3cdb3601752e80e85ae6c0fd45e5bed5/patadutatajufebevanali.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/q5rjm12kgumbmf0lq4p0sebof6/luwalaz.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609254dd9833b---rabolubexevefaludit.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/90ab270bd040b4ae3b233715ab98ef62/fabegusibubopijapo.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/pimusinevaxigoluxeta.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/mamezipitov.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/40149189872.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/jakumam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911766599e0---vomanelateladixade.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/afc614c45896599c07dc570ec9ec9624/25247835569.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/vajedusegoruku.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/4602323025.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/firili.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/rokebevogokomexotoban.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2107271609227872511s5gt3occv98.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/80359506936.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/repol.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f52c0fb4d---lewepisopanasale.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/97392473101.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/sofeva.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/72199414884.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l4gka6dr84lt2lg3qem5kai2c7/5954179407.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c1f3826a---49855333234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=docs+to+pdf+converter+apkPDF 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_off0000bd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD61 10636 bytes
SHA-256: bd466bff4c5846e748bf8991a0cc653d1631521b332409456129fcd238154993
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 16180 bytes
SHA-256: 55a264f4ae3b5b94f16b96509a746e60785d87860cfd868b2a294b3bf5e04187
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.