Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40cc99f7b8085a7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 02:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5d69210e2389897cf6a4b94449ef65b SHA-1: 46e32d617d9603c0da2770ad57752c25fbe231b9 SHA-256: e40cc99f7b8085a71abaad1908fd4248a06eb0b71e257695d7697ec89108b8a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=good+android+tablet+2017 PDF link annotation
    • https://aljuboori.com/userfiles/files/52959172393.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/wejudegerulej.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/07450cfb7f58258270474a282556a1f2/80706497604.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/41018086441.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/xinewoxaf.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/fubamolizesotiv.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/94348751367.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/19832066324.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0d53a1b5---bapusinikuwunidileg.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/59379024240.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/20910774963.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/67875740909.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109280324259815.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/49547108461.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/xuzatapep.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jatax.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f2b7870d---vimigipenujajemasime.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/guvalemuz.pdfIn PDF document text
    • http://varvshistoriska.com/file/gafuzuxakatapexurura.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/nigufiko.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/75439492457.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/66937506640.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/26949832545.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/lerijijolofi.pdfIn PDF document text
    • http://sakem.org/userfiles/files/2538366698.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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 10596 bytes
SHA-256: 5e04f1980ed5a8401077fa01ae4381d39f15ba5e78e4440ee546a2c554054c3b
font_01_sfnt_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 17800 bytes
SHA-256: 9c1460fcdeeed8514e6e679b036282a1b692544ee08bf2594b195cac41ea5045
font_02_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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