Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34f10da2e88f418…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 10:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a797c946b2e0a96ebf7654817b07cc75 SHA-1: 8d33fa0ce6b9a02936c7a5ec5355b222cbc707e8 SHA-256: b34f10da2e88f418f6b384f04a9c6aca7f43a5bffbb75ae2030f6c38ea670872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used to lure users to malicious sites, possibly for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=download+game+shoujo+city+3d PDF link annotation
    • https://alrukn.co/userfiles/files/dudatevib.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/61053495157.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/80563767964.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c397cbfd---napoxefuwitaxiropu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/vuges.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c7db7490fb8d3540677c165ef049afe8/10921226410.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132d30390345---novakanavodud.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210909_801C6B726A182586.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138814ed5786---60928035084.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pubekewawebawiwafix.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/51425996154.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109110043026783.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/65628156241.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/zufidosovamar.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/dujasolutasumifesup.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8ejb5k1b150ecik5hjj9u0p296/24563196523.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/17343057427.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/80534508403.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/xebagurotapene.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/pamibivaxojut.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/34028890555.pdfIn PDF document text
    • http://ge-mak.com/files/77384794734.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/42130081176.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_off0000c4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 18684 bytes
SHA-256: 7096f311b76bb8fc468850b4ab035290b0f19735f77626e7e7ff1ff79c8c77ab
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 11320 bytes
SHA-256: bd95da55ce2502d0073332232df7e437e8018b82434a7ee7a8cb3a817751e2c8

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