Malicious PDF — malware analysis report

Static analysis result for SHA-256 90df8d3aa65f5b57…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 15:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5760e1ed04c33a18d7c2422c01f25a9c SHA-1: cc9ba904f910f16ac2e549cc9dab998efd6c371c SHA-256: 90df8d3aa65f5b57a02493ca3219e1f921b3b8fb56852b94260aaccf975f93df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dsagco.com/Upload/file/77592817788.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/a38sqj0nofle9i5opb495tjtua/mijominipafupebalodor.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021080401240273499.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3bf2e74995f92340e67194011d9763f3/joxadisigeli.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/jijomis.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bcb8862fe0e057a2340d81bd2ee06b51/voxirujuforogalek.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1626715190.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c0af6fc70---vinoxonarinovabugumut.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/46272705993.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/8059592707.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zetiwe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44e1jl3rmj39ibda6i9p90j256/jozanotukamavedaduseguxar.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/12776174324.pdfIn PDF document text
    • http://hydrem.ru/images/file/wiwazowodejan.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56075340337.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7367db35a---85813449345.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/noxitoruselodowedulabum.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9ceb74a924df6f9c7b7b5d2bbd8d5a81/kezulezekagefuwavosag.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/56801392413.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e500ad119b---53033251080.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8b4b2f06f838063b0e0fce71eda0f2e6/xozugarakonovuru.pdfIn PDF document text
    • https://webmenuplus.com/images/file/54909275478.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce7a4310e---jubilodutimusagivezegus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=shineray+250cc+manualPDF 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_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 17716 bytes
SHA-256: ddbb072417ebae044cd4298155608a69a261f22b72b28a750c524f2e39b20235
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 10772 bytes
SHA-256: cc13438190578ae43a89f36f6974e71c836c8062edcd025b679c5882f6df1767
font_02_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1