Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4d94f967eafa5e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 03:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0ef851c70d42b1ddbc9f218e4edf398 SHA-1: 630e9b75be7340991cbf60bdd7ada3e1e6b3d6ab SHA-256: 5b4d94f967eafa5e85e6012775dd43a0d00cce7fbb9f9ae9b71c7d4243da6767
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious websites. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rumahbaruku.com/contents/files/bipanodedi.pdf In PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/topifisewakavusi.pdfIn PDF document text
    • http://elskenecologie.nl/files/871857375.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/nanifirolatinuwasujeras.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/30722744302.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/25349491774.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/99629643162.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/zejukiwusakir.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c1a8a886d4a1b34b89955412daac8082/19419301358.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/71113119582.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/70859671535.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833fdcbda7---24985959975.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/nodoreti.pdfIn PDF document text
    • https://faceless.me/userfiles/files/25063257345.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/litopanuwused.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0de0b618---deteku.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0epclv00prpalgp7bd961717so/vubokupuvejosokupesope.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/girewetozubake.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/38261358639.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/52953813427.pdfIn PDF document text
    • http://imbirimbir.ru/files/90552761270.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/13601592604.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/sagazumupafafeb.pdfIn PDF document text
    • http://only-svet.ru/upload/files/wamifif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mp3+downloader+sitePDF 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_off0000af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7A 15464 bytes
SHA-256: 12c74c71231761f1f39a155d45765ac1750a65ae3b469e16873036e0aef922c1
font_01_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10636 bytes
SHA-256: 6a9f173b794e5d7186f2a7b815f01884d97852697e74a79eee2698b8d1bd1244

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