Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d63cf21b9a8aa01…

MALICIOUS

PDF

91.9 KB Created: 2021-08-26 06:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5cc17a2f28e963d4dd9a08de02650c9 SHA-1: d3c0da441e2514ecc4bc2aa94c7807a46052728e SHA-256: 5d63cf21b9a8aa018152144e37500ad2ee0e9833e3f54a860bbfb556a320f410
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious sites. The embedded JavaScript stream is a common technique for obfuscating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • 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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e73e969b9219f63d142d36325d356828/goxijumixakomufijilaxido.pdf In PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/60172178315.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/dalas.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/18678526332.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/vifijanawekusenip.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b278afcddb917b2c3430d7dbe2a45619/72490237619.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa66c58ff0---pegisobebenizozudaj.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/5538089802.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/29917381625.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/muzotularajutolubos.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ouroqeqpnc1bcu8rlarsmm4dl1/13227344413.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/91057342992.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/xerapatuladeded.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ad873b253---70553338750.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qhrje54q66k8kfc43s89r6md4h/dodojaban.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/10447413314.pdfIn PDF document text
    • https://aitalk.vn/upload/files/fowinasema.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf05761ce---wukaz.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/tezonusema.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/57709045039.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/37735433202.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/k1f35so4ai1j6dcgnsaf83conm/62681511772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=china+national+intellectual+property+administrationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 4452 bytes
SHA-256: cb767513a0e992763074163d9fa8c73bc846932b282cefd25306b73b2d6fb52d
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 11024 bytes
SHA-256: 98df38127013c47636b4ff24bf04409688df5805ada3fa8af8e1a9b9d94ecaa3
font_02_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 16852 bytes
SHA-256: 21e0f30c33cae539ab18802986f79c1780fbe1a2165479f9dc274d60e2f9e603

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