Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0f48c04855a62f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b7552d6158817fc8974ef0bc44ae3f5 SHA-1: 4a447f0f83ecaf5eac052215053409a8adfdeee1 SHA-256: 5f0f48c04855a62f38aae7c3e18384bfc761ae469ffb77a076cefd456cf59ac2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=an+inconvenient+truth+worksheet PDF link annotation
    • https://andrejc.si/files/file/34385987152.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/affa9c32e8a87a2481b6cc58055d983e/69264964727.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/noxofovebugozowojaw.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/lozaxozeperuz.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/nudakabixutob.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/dorazeguduwe.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r10mvp1qkg03anjoci2m28c2hi/fasuxovesorigo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a848f3f0b46---nosepusojibabeb.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/nodosaf.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160833cc30f83a---7986041186.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/jud1ugoa4ec4fllhq7o0b1kd6e/76578558154.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe9d724d4d---juraguxesulabofaxe.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16072546d7cf78---50957004605.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nofetima.pdfIn PDF document text
    • http://18554080.com/userfiles/file/vupegoz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/19c42535e6b0d83d6e2f8b139451310a/58541336419.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2df3306ab---91067654691.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vumubuxumuzatusepafobu.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/36745643787.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/dusubis.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608285d2d0002---91172961172.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8dtub9m4s7dvc074aei99tc69l/pilikogeposibuzu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ns85d64ovei13e0jcb1tc4qv0e/68166836313.pdfIn PDF document text
    • https://codecs.ro/images/file/jurotitobogujoror.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/50621447987.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_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 16400 bytes
SHA-256: 7aafc5bc3fbaed86124c2dfe1002e8c691389d5bdb5457270d9b545ad230b1e7
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10444 bytes
SHA-256: a14be1ab5a210e7692e7a52cab4b982976af75949776a6e813dbb7929b772c80

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