Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4bfbc70a0fa84b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 06:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39709c20c263761a969cf1089758e9ed SHA-1: 7005df76a958ccf56d116a16f5b024f8c9e5170e SHA-256: 6c4bfbc70a0fa84b6814ca3b65d942205b87a3dda04267f4e2708f1b41ef52cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly indicates malicious intent. The embedded JavaScript likely facilitates the download of a second-stage payload from one of the provided URLs, such as the one found in the PDF_URI heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=download+game+turbo+redmi+note+8 PDF link annotation
    • http://slxiang.com/v15/Upload/file/2021910344189535.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/bureminosupejewo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/46050782119.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/wisafimaso.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/87036873476.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/2681515796.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/mosoxopapovel.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/tizewitafagamafug.pdfIn PDF document text
    • http://elitvorota.ru/f/file/8284319870.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210908_B8C630383A502DE6.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nigekenewiwerukovo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345ac5d6218---xufulorok.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/9499953659.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/vaxamoronumirotuzevi.pdfIn PDF document text
    • http://cftckr.marketsearching.com/upload/files/84457969637.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/230759770.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/54060202166.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362620b702c---24594953384.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/35224010630.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/mdqhleemrb0a6nt8k3s0citgma/3221338406.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/61341759599.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/medojagorebebikowiganigaz.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/67510825076.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kidiromoduxodamivijo.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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 19720 bytes
SHA-256: caa37095f7c5344244ea7dd44320693b808e41ed121ee671aa7b7ce9c3a0e7fc
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 10960 bytes
SHA-256: 0dfdab5487088b6f2b0798fcd279e175b05a2f2a5aa9b9d4a149dba6241f3d78
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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