Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a9bd01d9afdc7f…

MALICIOUS

PDF

107.6 KB Created: 2021-09-07 18:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6129ef8d2afe58ca34ce8d64ae19321a SHA-1: 1deeb518cf8ebbb1d572cba46c6b16f1032128db SHA-256: c8a9bd01d9afdc7f4aafb778ab0b61278b4c87d40660998af03ee3ff6ce85ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The presence of external URI heuristics and link farm indicators supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=hypatia+book+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a2f79eb0d---18930039765.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvaak25c5j0dtlk37tnhgakut0/20653130044.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mujifogafuwumosiv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dda92b4166e---rugiresaral.pdfIn PDF document text
    • http://mfahk.com/upload/files/9807490456.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9jv0alfu31qsf8d89o61ai0p2t/saxim.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd1997cf8eba0764bd190dcc34a35330/75462734541.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/74148375859.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/75919605590.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7d397c04bc2296d7b7de82bbef1e8686/dazokafadas.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/rufuseruxepubuk.pdfIn PDF document text
    • http://ruresept.ru/files/file/masevibumujogexajerosef.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16125500fe2ad6---ninemafejiniligujano.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xavisoneporimikevivoleda.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d880a959a3f335211d6548190e0cb75a/xadipovugadagex.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/48483280618.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/xezububizat.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/kbscvg2dt0a2k0c0hvg6eo1ibm/20229482082.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9397a2cc---vivulufunizilabuxuwedu.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/79059884107.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/mopepikefawon.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/mizex.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-7/20210607223920678453.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_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001530c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530C 21636 bytes
SHA-256: 8085d920669c5cd80e23b188dc33afad286f991c6d6d8694b5b65827f7d53f34
font_02_sfnt_off00018a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A19 10276 bytes
SHA-256: 2097428e85cc2fb3d8e5e9f080f124f2ca5753a2c7c0e225deda53f52dd89659