Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ff8e6192891c6d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 12:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71d65de5ba93a4ae2ee2fa8481232426 SHA-1: bb1307a59061f4d7a1b8c3626ba79dfcf7b72d02 SHA-256: 73ff8e6192891c6d42b76fcd6d8cd577a840b604db11faec7069e05c31b23aef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://chcial.ru/uplcv?utm_term=passive+modals+exercises+pdf PDF link annotation
    • http://ned.ru/uploads/files/xixitegulidixuges.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/wimuzulazurupotuge.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/guletagorenosajiganefi.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/40490868775.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/fasoxox.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a502a7a9fb3---89476286588.pdfIn PDF document text
    • http://www.77ice.com/upload/files/3067833898.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d12f9447841daca7dbd255b105fecf25/zezozalunigevijorisojiki.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/37048036922.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/zapuw.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210702_C4B4F9A11B641BBC.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xuxiwijaporares.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/47935523218.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/kaziti.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a86501097fffce335371b8c1878ca2c1/50086716500.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160944146540df---sopijaralepujudute.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/26062158312.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7067c2c97993c2dccf0baf04d5f92f0a/ziwudipevupunexa.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/67306349862.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/1551923036.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071947f610c0---negepalirewej.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dovin.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/favurudazemakedijobatowa.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd25086c5a---53237290059.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613537267e98d---kifakufe.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_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10748 bytes
SHA-256: 4c2ab6562b20f42034a31f28b69a184687ffa4f69d4413331a7b1dbdc055d0c0
font_02_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 18304 bytes
SHA-256: 5bc89e6f06b925d42a9804c4f6f5488e226e72389a412d9ae5f8f0c7ba2348de

Open this report in the interactive analyzer, or submit your own file for analysis.