Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c68406d9a2b837…

MALICIOUS

PDF

95.1 KB Created: 2021-09-10 23:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca1b10face44e0102fc5fadae5fff12e SHA-1: a50bca6a9e9c011c6fc22d246d6d89afa9c4026b SHA-256: b8c68406d9a2b837a6ee3f42d68f6126b47a94b9c2dfd693801cc15268b5ee23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised websites and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://studiopedrazzini.eu/userfiles/files/15166641259.pdf In PDF document text
    • http://scuderia512.com/js/upload/files/takijovarurowalibom.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/galizomizezefakonanef.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7e155637f1cd13e4baa4bc22a5737077/fugiserowumibavez.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/zabotefunefavul.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/97588806814.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31200916027.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a40be1cc---tujedaketenareminirusopil.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/xikovaxi.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/wasesujo.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/petabida.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/duvodikodov.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/nagikesirivan.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/kaxelaforinonebipaxi.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210901110323.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139616ddcc33---kuzizasak.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/joxamopewimivanisozi.pdfIn PDF document text
    • https://svltv.in/userfiles/files/kewij.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/pimafuda.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/77758301303.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/97373168257.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gepobijaxosalewafaw.pdfIn PDF document text
    • http://newmob.it/userfiles/files/lemolibazafixud.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210907185542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+clans+october+2020+updatePDF link annotation
    • 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_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 11140 bytes
SHA-256: 6b869d00370566ed5ca48256130ad911d6cc04cdf23bca6e637501409b6f73a0
font_01_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 21080 bytes
SHA-256: 97151362c2f67d0e62317ecf0d3e2f52b1a7ec916ce5f6a471e2cf86f750f01f
font_02_sfnt_off000156cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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