Malicious PDF — malware analysis report

Static analysis result for SHA-256 231349b5c57e962a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 12:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a7b33a95d6aab99d3777e3878e25b5e SHA-1: 90ba30158748f686f1ee33735a9f99f557908d12 SHA-256: 231349b5c57e962acb7e682cf810ae6533b10f82b6f761bf7501567a8cc326e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=download+app+mp3+music+downloader PDF link annotation
    • https://samsunyapi.com/userfiles/files/14725162839.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/xapavalupaputabakivir.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/gokukibadado.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xojoxizi.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/wafavisene.pdfIn PDF document text
    • https://pcetravel.com/files/file/79861676371.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141385c77d2f---lavuwokoravab.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210911file///67289908475.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3259735cd---46456289392.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614100e180d13---fanetanisawuzetino.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sijagezivadodemok.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8064012ec14b3d82dc1ba0b903182a80/58826704344.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/rojekezopusetenado.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/39848729738.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/98661936377.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/34207329780.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/81765591954.pdfIn PDF document text
    • http://apart1day.ru/file/lutuvigibolo.pdfIn PDF document text
    • http://art-ball.net/files/file/49552792658.pdfIn PDF document text
    • https://inks.bg/userfiles/file/monexojilage.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/33921214043.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/42361923030.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/zobitogabafaketibuvodo.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/31523796267.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/39180863457.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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10936 bytes
SHA-256: 46c644ec6d0f2c377efdcc938816e018fce9a98638ea26eec85810774735c679
font_02_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 17868 bytes
SHA-256: 965d8b46ac89fe0915b5c2080a3f0031f0675d11747161b8c843580d6174ab46

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