Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db014c4ce4b6258…

MALICIOUS

PDF

74.2 KB Created: 2021-06-09 06:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 50ee3c0ccfd0c5018e17fa997149998c SHA-1: 042af9496af1980508729d93728f1aa6a2ed90f7 SHA-256: 5db014c4ce4b62587fb370b653d920fb29f6f04885f3d0e888105191b7665ed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous embedded links, many of which point to compromised WordPress sites, suggesting a link farm or redirection strategy to host malicious content. The primary lure appears to be an "Experience certificate for doctors format" to entice users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=experience+certificate+for+doctors+format PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969185d792b---sigijutikerulidagin.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/32113501276.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083532b6b15d---vobijulevawago.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0824a23182a3f6edf9e8d514b498296f/36892041722.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b964822816---nomirolujivexuwigitedel.pdfIn PDF document text
    • http://mp-journal.com/media/file/15427890628.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9310cd746b---12058636419.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/redomevorogudazagerekames.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/jujoxefe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/2107244976.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857adadc322---mozokofoduxeja.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/22145269216.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3198c8302---73746400010.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/lolivo.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/siloxidutotujemobex.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/64e34c9bbe84f32b9d23a9b5ab2c1c30/jidadorufajuza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 5292 bytes
SHA-256: 605b9927db1741b5c3c7e98b6c6df4070195461d30f4d246fb4c4573693a357b
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10584 bytes
SHA-256: b47d3ebee64b297d2013f639452503dcb982c5796efa83c061cc5f915e2b1568

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