Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2773ac27abfbba8…

MALICIOUS

PDF

99.4 KB Created: 2021-06-12 21:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 13e8c986749052857a00d7b0a78a8e43 SHA-1: fa5ca5155b938cc22e4aed8bbb146af06b8c625f SHA-256: d2773ac27abfbba888945845f3aa83f158bb70fd6f0e1cfb1ef2ca504b2de04f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=ardhanareeswara+stotram+lyrics+in+english PDF link annotation
    • http://psychoterapia-przemysl.net/img/userfiles/file/49371409573.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6428fea46e---22756284037.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/efc200tc8grmb7qb9ejmrucub3/62399188126.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/befowo.pdfIn PDF document text
    • https://ivanamihic.com//files/mezorusuxidolam.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210605040905.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qaocsr2nfqsabcauujupgelhcm/ripopuxalapiludawugab.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/d5qfp407beu4p1vik2evpskuq2/nazobowaxagegesakigilopi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909dc70a6a3---gexevawodoxosanifigum.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/delet6vdg21qf4cjetkheupkf7/10781925637.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc1a10d661---vatenolipaxosi.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fevepitefetatu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4aae71c6d---bukotu.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/kowibesewumurarinix.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/1674311461.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1eaa6f70---65246258574.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed92b513f---94777882080.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00014bbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14BBC 16780 bytes
SHA-256: 97bdaa16f0946f32da211632d0f1a2ed568affd91106988e78be2e0d5deb4b7a
font_00_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5536 bytes
SHA-256: d8cfffef399017b5939b33f4ef3726b67babfe362dcc19faedcfab7a39985351
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 3772 bytes
SHA-256: 38ca0e522c264f10566fd8f9f5c124bdae5fd36c6204e1bfeee9d4d6bbef3686
font_02_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 10836 bytes
SHA-256: d56f4aefe2d855b62419200e938e989fe70f2aa3c5c3defeaa078005e096a4f6
font_03_sfnt_off00013616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 16228 bytes
SHA-256: 6063100ada87e14f663e133af1a8722355553092d5226ad489766dcca99d6b45

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