Malicious PDF — malware analysis report

Static analysis result for SHA-256 4536e7a53b586b0a…

MALICIOUS

PDF

81.3 KB Created: 2021-06-27 18:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ff1c73ff6f6aa13d4ca5bf2e276762e SHA-1: cd4c9caf1b0260c3186304525e87b75fdb79a2be SHA-256: 4536e7a53b586b0a05bbdeb8d8d4b9b1d60791488713a760aba9b145a2db88c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=video+background+video+download PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/da533417db449ef4b3490a596ec4527e/fipelobedarulomazavanexe.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/66a9485d2c67fb7b55969afad5fb6489/leviwivutoleteta.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/9691093945.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/wamaros.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a397e4382---fanikakuwafobis.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e564b2139aeb099ce9db404c42973920/15705050023.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608695f401876---99264229421.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/9179325074.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210530143547.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fesoje.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/86759980685.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/2120198812.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709580b456b---11864571171.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e156b276c535d16aad3cfa7e5c70f671/35645987180.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091e158ad312---weziruribabedasutewuv.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c94a917ae---42721064225.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/87144104329.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sixesewi.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/a4e971f233c9fda8f6b92c33917396e5/28387806035.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b31baa39150---81683383010.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7aece4c565fe9a75e8ddca98831a6daf/kemapape.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/29344661554.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10732 bytes
SHA-256: a74d1c17932fe814daf491fa02745b6cfd54b489733bf32ae45f2c3c498109cc
font_02_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 18976 bytes
SHA-256: 63b34eeb12c033094a8c6017a6d6c408ac458303e767589e7bad02c9aa621d8b

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