Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5eb30ef3647868…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 19:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb7489b3890c708583fefa2138280cdd SHA-1: 8009e6ca5bd2555cb646324097425d449249f94e SHA-256: 3d5eb30ef3647868cd9a5bce41043a8d1316c254c1bd8926b291cbd4d241f4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to files hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://rnralpha.cz/res/file/dawafeturamod.pdf In PDF document text
    • http://lokalsport.no/userfiles/file/24755243876.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/83579669491.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/77451171297.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161388ae6cd442---tufomosixapokigifukixagil.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109012130051461.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/loduboziraredegivododibi.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/tanelasagexilononobufav.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6fdd29027559aeded5652218d2fc49c7/xuxazolibulavazamufa.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/bitiriborumakatewifuxo.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gisusisuwefusaxevuno.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/55921217488.pdfIn PDF document text
    • https://verner.lt/images/files/podiwaxigalubogowazokek.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/85c657754f462710c0fa1c56e698f78b/6092737469.pdfIn PDF document text
    • http://sns.hu/_user/file/50242713099.pdfIn PDF document text
    • http://e-sheremet.com/img/49415532589.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/basinixab.pdfIn PDF document text
    • http://elitk.ru/_files/77766282330.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/95930693775.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jikiratanumosukez.pdfIn PDF document text
    • https://proxus.nl/file/95037428142.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/7773937558.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/sixewid.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/nejanaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+open+phone+lock+without+keyPDF 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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 10424 bytes
SHA-256: a176645087ff66166158cdfecfd4d93b7348ea4a99c154ffb50226cb1f343fe0
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 18004 bytes
SHA-256: f7f6dbf854ad53aac0f386f555c48f075c0a4413849781dd2e96d628e09d68bd