Malicious PDF — malware analysis report

Static analysis result for SHA-256 272ea40339bd3f89…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 22:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86b473b5a9ea1e0007c6f2d15eb6e4fc SHA-1: 96a9a2af06bd225e5c25d9d59df624aa186fc93f SHA-256: 272ea40339bd3f899ce1f15a3e9d5b3c78edc752fee3353856e1c37d01b1bcaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as http://elementsgogreen.com/userfiles/file/tudesuduluwobipufuxalisa.pdf. This pattern suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=anthem+for+doomed+youth+poem+analysis+pdf PDF link annotation
    • http://elementsgogreen.com/userfiles/file/tudesuduluwobipufuxalisa.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/wexabutuson.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce33ec9a53---53961515186.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/7823498515.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/xuzaxojupadexuvokilakab.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/givev.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/67632439129.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gaxugadimonekajoji.pdfIn PDF document text
    • http://punaide.com/userfiles/files/66077138662.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rvh14aaagt33ck941otl001f84/borokenupik.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb58a37b14---fawafak.pdfIn PDF document text
    • https://vestol.bg/files/file/88176553898.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7a575f68d---19492574275.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160756c8336c4d---liroguxotezubeluletare.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0a6e147b---91797150120.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f290e39ed3---xodabinibegoseli.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/10108884892.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/favekaxazobefus.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/togbf8uf8gqs5m41ma15vq6lcl/kiluverivavodabisipedep.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/76080201108.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/db97e187ee8105216a4d5b0a5dc7ed1c/jexojutaniwoxofuworusa.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wekaxunegatoxel.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/43909649138.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/52fd935448199ccea48759ae8cf74a79/fotalodujewoxat.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ff4eee6b7db616dced29a2b8d44cb122/zonexunidupijadapevozu.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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10956 bytes
SHA-256: 89c07c86b689d97989cd90baa5753f2d0a5057ad0fff7bae631a542779bf8e70
font_01_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16912 bytes
SHA-256: 3fa4131a8a1ca93bdc420e829b5d245f32e97b02f1594aa1719e3f88a73f03fc