Malicious PDF — malware analysis report

Static analysis result for SHA-256 992ba98253f661cd…

MALICIOUS

PDF

71.1 KB Created: 2021-09-15 11:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 910deee59db63d17d7ed7a4f0945a25a SHA-1: 05452fc96cf255d4639b6be6bc5c5512d29b5da3 SHA-256: 992ba98253f661cd1d3eed9b5f15400ac8f3c7fd5befd241539886cd8e28e076
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, such as http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf9177adb---rujefe.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://newegys.egyseg.eu/ckfinder/userfiles/files/52517048354.pdf In PDF document text
    • https://ontogepszerviz.hu/editor_up/31151457084.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/71430245389.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109121217594136.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/38672186360.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/54844087954.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091123131692.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/5a65273e967c970f29ef62aa213d5772/sozivakeko.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/norelurifibexukuxakuwon.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/995331085.pdfIn PDF document text
    • http://pololanna.com/user_img/files/15750464682.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1250eaa1---vijiwaluvobixagesisu.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/kuzopunegur.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/pejoror.pdfIn PDF document text
    • https://parfumzone.ro/files/file/zibuxibipinerejegix.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/rubezakogufabosuxi.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/72935586096.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/19392980625.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd3ab5a4b---1093326960.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/46617145620.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf9177adb---rujefe.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109100818318127.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/debakufusimapibesovarabox.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zafefarabozawefanubin.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109010651301280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fire+tv+operating+systemPDF 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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 10708 bytes
SHA-256: 20366bd337da8848f8d17d4e7567498f07d3adb42330da98e6dd6106cf18bd5f
font_01_sfnt_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 15688 bytes
SHA-256: 4320c0291d4019d535c3563da55054dae6d64e3023c10a38a246d609f12cca94
font_02_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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