Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a25e7a0baca6d78…

MALICIOUS

PDF

95.6 KB Created: 2021-07-05 22:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 08098bbb8220c560fe0b221f84fe6655 SHA-1: 74ea9ccf46d99bb1fc642d65576732272e53778a SHA-256: 0a25e7a0baca6d78e021b1963c4e8b00820608a434d20d2947313582ca22b4f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=microsoft+office+365+crack+license+serial+product+key+2016+free', suggest a theme of software cracking or illicit software access, commonly used in phishing campaigns. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=microsoft+office+365+crack+license+serial+product+key+2016+free PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fcd835adf0ed5927c22e7f40801975a9/37705463213.pdfIn PDF document text
    • https://daismene.it/file/58297149381.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2u28nrt5esm81pjg8ovcp0561f/50274063478.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/9f5494d9fc8f11b8924d2f8671169a5f/37402740260.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607586b8ad14a---71183677075.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ded9a0b6ae95f3bec2e3a1cb0008c603/22310968903.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65c2bc750---lapapomevi.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/16245687902.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d9737bc9a---somobap.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/kirukutofapuzedodotaz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/11f93dd5a3020282cdddb214b2d37f44/73703331033.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/661499f8c6b8a4e8d2e180cf95539b6b/16496822194.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75b06c6dc---wibanuwovesuzid.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42db7957fd---govuku.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sa2mt0bh0tli4afls4b40krnid/26079485455.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/gln4o3dt173oisl8k2smvsbeu7/79323973830.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/6364273848.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/jukel.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/xubadipiwopafe.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/17911974019.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6qc45hi4rhb4smfcglupjia6nm/78662893938.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce534087c---67592500857.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/kokolomuz.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/medewenexo.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/zikiwis.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_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 11680 bytes
SHA-256: 8295c83c48664c040d5b64f3aa2137f27816c3df7b49cc38dfd070b145fe8749
font_01_sfnt_off00012993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A5 17800 bytes
SHA-256: 6af2b5f2ff709d73b1af13a252cf0d6ca283c91b3b3afb14d481853ff0a15b45

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