Malicious PDF — malware analysis report

Static analysis result for SHA-256 23307a3f72d41220…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 16:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9102795a6f10bddfdb4bc932b6299e84 SHA-1: b8deadffbf32ce2a50a63bdde1159bfa66fe6d91 SHA-256: 23307a3f72d41220b524a5335ebb5e0b5d47156ee300ba19f5773c6bb332b728
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, indicating a potential for malicious execution. It also features a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 https://coretry.ru/uplcv?utm_term=presentaciones+efectivas+pdf PDF link annotation
    • http://mjsolankifoundation.com/fck/imagesfile/33707809995.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ea642bdc---79728808679.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/demubuviwuruvavoj.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/kabevekegavepagagaraxew.pdfIn PDF document text
    • http://flirdining.com/uploads/files/nedeloti.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ou49u34pta66gmof5dlc2jb425/36902571037.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eebf2417c---4930500971.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/19495733928.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b0d6c2a13d58bf840b2d0f277acaa9bb/tupogi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b498945f---77273105416.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/97846731414.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb35573e47---64930063790.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/13646079570.pdfIn PDF document text
    • http://novichiha.ru/pic/file/7455631876.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c679e2dae66db165330a46d0b2947fee/35882607818.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/93564818740.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6608e87b91a34ce7cdc1828819ad8898/rimadugusofiwepanovit.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kulosaronakebulawobexewap.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/58274573481.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/94061556921.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/pesumoza.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/dovarobiximiwepoputorob.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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 18748 bytes
SHA-256: 2a6a5ab969aeb5cf1819433012fa71e1bda6bab9df97bec60a84ccc6bd8acaba
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 10636 bytes
SHA-256: 7ec40a90646327afe22df2441b0e1f2f302e96c9766fa64c3995b6a2a730f40c

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