Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94ce80c0a8eed17…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 13:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 457775d695e571461224390307131e78 SHA-1: c0b3858c4ad78531cd11af5befeea9da6ac8d229 SHA-256: e94ce80c0a8eed173ff8beb55bdea38d0d16421755ac71a60118f1ffb5403f60
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering to trick users into running commands, likely to download and execute a secondary payload from one of the numerous embedded URLs. The document body was unreadable, but the presence of multiple link farms on disposable hosting and compromised CMS uploads points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://chcial.ru/uplcv?utm_term=change+video+resolution+on+android PDF link annotation
    • http://dilimkebab.com/userfiles/file/xuxorirufemedolonukuri.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904150735.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/89493213649.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/60653468919.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/25754830059.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/konigobid.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/besavetarofisu.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/menatapuwivedex.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/savemeda.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/28639088734.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/4140285268.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398678eb1df---kapaguluveminelebe.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/mefejofu.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/55177765927.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/nuparabusezorof.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/11921090978.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eb5394472abedd84875fa140cbaa2f30/puzakonabunezuzoraxus.pdfIn PDF document text
    • https://pokereshop.cz/data/file/xonojajikiwemipemigu.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/84922242184.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/rukuwujuze.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/912cf2610a7b5f843c6c0d2fdd3621aa/sufow.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/pijuwunidojere.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/sobunozisasitazenebulujez.pdfIn PDF document text
    • https://abss.pt/userfiles/file/sunemewo.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vegumirowidu.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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 10724 bytes
SHA-256: 7f6e3c0535eb6e38ec9e67f39d2accc167dd5592863ad28689d7e3683d79e14e
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 20120 bytes
SHA-256: 9ccfaa82ad576c5073dc182128f4cef342f070eba662e0a31649fe6f48a63dc4

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