Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c0c32075637197…

MALICIOUS

PDF

85.4 KB Created: 2021-07-30 21:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b74dfdfebbf972cbfe202544efc7dad4 SHA-1: c71203bcc389004b7ab52d2061bd2d5c5575a41a SHA-256: a4c0c32075637197d5b29d2f71c4f9cd2da90a0f5f60ff81177a4397e66391d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://naasschoolofmotoring.ie/fckeditor/userfiles/file/lujewepopuga.pdf In PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/mewojifojopirubirigopup.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xotojemifagogezaled.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/jujava.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/91018238764.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/c17qrqr6su4j99lqabavatur5c/vivig.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qo3vjik00dnj0tnkn2sh4eglh3/86861900186.pdfIn PDF document text
    • http://unseretochter.ch/images/file/dogusixawido.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///paponekuxal.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beccd5d7b0e---85400723639.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/bufugumagidasuwomumal.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/30055087360.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabb79312b---24108766313.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a7d98f4affac85b26cb02e353773506/tipugug.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/delokewoninezoralinudin.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/080v7i4fjicubni6f594807pks/dapenilomivaremuxabunoke.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16262028929623.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a95rd52oirt82t04aqhpd95052/54100768346.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c8e9faa7ea08ddc3dc0779fffd6a6f12/18477212832.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d71d47449aa7d306c668b5ed1759db51/buvab.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/juzujobufemagomowovazir.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4783743f---gawuwupazutunim.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/sofotote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=degree+of+adjectives+worksheets+for+grade+5+with+answersPDF 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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 16812 bytes
SHA-256: 3385ef8c8971b53778f3dd36cb03c61883d2b180afc5a0b7988477287a89362e
font_01_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 11216 bytes
SHA-256: 6a4f70b7b2f225670319b3e322c4478315ec0cbdce803adabbbf69c3986e74b7
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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