Malicious PDF — malware analysis report

Static analysis result for SHA-256 f369ced6a292e895…

MALICIOUS

PDF

107.9 KB Created: 2021-09-06 02:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36fa2a7558777ac21e50a658f9efe901 SHA-1: 8f7953c7c6706f4a7441ad33060ef685b4922db3 SHA-256: f369ced6a292e8957efd8597e7822f2c51f7f776e891c007aecced1f6102722e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially compromised websites or encouraging them to call a fraudulent number. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=telephone+intercom+system+for+office+pdf PDF link annotation
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9tt343lg8cguhoqdohituc8l8j/lavuwun.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7102923ace428baf18085b2d91785e09/15423655328.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/34559248558.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca2bed481---vajig.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/dubekimusivaxaxaw.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210905_C4DBA4872BBB945A.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3edbb5435---94764198640.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f37cbd68---18518155086.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/27536154239.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/72029124145.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e72327d4e---85452602489.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef909e1f1---lelujuferulap.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2i914ull7u462ci9hu2o5itnib/72625110448.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/natovuma.pdfIn PDF document text
    • https://penzion-palice.cz/content/26717416765.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/36691046141.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131316011484---3653241141.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/9283164062.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/vanazapiwa.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8473213070---88068025428.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/89394490032.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/97004539303.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/kovorolizefolozuvarelure.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_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15458 10800 bytes
SHA-256: 44b40d5e1b0f7eca18b141a44e7873055ae8066052c010b74e8436b01541406f
font_02_sfnt_off00016d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0A 20256 bytes
SHA-256: b561b450ae790e0085e66146aaf597c80df4034dd92ea2ba65c959083e8c33e3

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