Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f253aa49e4ba0c…

MALICIOUS

PDF

78.5 KB Created: 2021-07-25 02:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ef5610068d859b8f665728ce0599835 SHA-1: 26b76b5e23a21cbda9c831f3f75a8db402aee75c SHA-256: f5f253aa49e4ba0c831e651c9848f07fe48fbef5ad2b3010f130d21bdab7fc92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://regimhotelierbucuresti.com/images/userfiles/18475286633.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd249c5eba---54570767111.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae5f385b41---50084737532.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1bv914ogv701r5e30r80361faj/nasosuwopuzevotidilavon.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/bigokobozunofurabibesawa.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/32599690257.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/76d5f56fc54a9f9a3353424b7d8e6df0/sudoxapitiniwiruve.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/aba6830a6bc5e25ec7b0cde0bff28ad3/45626258647.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60964e9d59---29910236937.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c1ba4a94a7efe73e06352a873a2ced32/kuririrojab.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/58060338004.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0f3561500c3f23b4069b7231ca5c374c/3774315789.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/42499156805.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xugadageseb.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/pepabitewelomijumonev.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/dd166e2cfcda5739b528e52446b11434/8399286248.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/b42jl5egojqivbp09bhmviic15/tulazogekilisaxojepa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4e3dfc93---51506765786.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/87916013321.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/73641661089.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8dc59ade2e21a0c7abdbaa7baa711fb3/dutas.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/75843774602.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/iv8rq2nbcmpokr0bcrp706ojt3/15055787786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sadlier+vocabulary+workshop+level+a+unit+6+synonyms+answersPDF 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_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 11620 bytes
SHA-256: 7f3b253be3ec83d524232a475c1cc88539ccfdf39f1b582806edf11ae6ad6dc0
font_02_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 17576 bytes
SHA-256: bd9c5bea3c5a77faaa5302dd0fc7d983b5f74ea758502101a59923103a15b810

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