Malicious PDF — malware analysis report

Static analysis result for SHA-256 734ada47df0944bd…

MALICIOUS

PDF

72.5 KB Created: 2021-10-02 22:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8015823b8669ebfc7fa847bb58e9e2cd SHA-1: 2bca43363aff135f9476b3e6899cc91d5f8bc858 SHA-256: 734ada47df0944bd6633ee33822590cbb19856cf9de2f6feef5df469f8da3703
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the redirection to malicious sites indicated by the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=what+do+giraffes+have+on+their+heads PDF link annotation
    • http://ranaghatpchsschool.org/userfiles/file/74740116970.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/muvalububaderezovevanizaw.pdfIn PDF document text
    • https://synersys.fr/contenu/file/givaz.pdfIn PDF document text
    • https://rosycaffe.com/file/dasojokevi.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/56890437750.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/gasiguvawefegunuliz.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/merivug.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/fojixaweruj.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/58792955062.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/vofobuseluzabonulepise.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/tebadib.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3cut9ph5elmsmkdsg90vhndqcq/94667300865.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0486a45d7266d8997fafb28ac3805622/zinexodidijubato.pdfIn PDF document text
    • http://pasaru.com/upload/files/warewigix.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161584f069885d---xakedeteto.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zidesogasomikun.pdfIn PDF document text
    • https://blogsma.com/files/83363848209.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/66961391487.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pubonuvemugidus.pdfIn PDF document text
    • http://hingliltd.com/userfiles/20068478594.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/4605653307.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_off0000b484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB484 18640 bytes
SHA-256: b546ff6421ed01e312dc32c2f476cfe67d2ba05e0e2447413c5e1701e1555344
font_01_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 10648 bytes
SHA-256: 7afee328a391e0f031bf2e36263ddab44543fbdb36e3d2af8a09287363d60ca7
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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