Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bc3f66ddd068d9…

MALICIOUS

PDF

91.6 KB Created: 2021-08-07 22:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5efd80884f7a81e04be217395f202b84 SHA-1: ce9c6460e09b5cea11c40f3983eb8a392597539d SHA-256: 92bc3f66ddd068d9fff0d177755ab62cb5a3149c63dde288dc9dfd8b419cc8b1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple links to external files, suggesting it is designed to trick users into downloading further malicious content. The presence of a 'Fake invoice / payment lure' heuristic, combined with the numerous links hosted on compromised WordPress sites, strongly indicates a phishing or social engineering attack. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ce160a1e---30977005791.pdf In PDF document text
    • http://www.hussco-steel.com/husscofiles/files/10852197090.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700353d2719---13872192208.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16086f50790e9e---59174629866.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/73653038959.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/50630790449.pdfIn PDF document text
    • http://piecco.eu/upload/files/kinunajuduvo.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/bipudigiru.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/javusasiwemiritu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cc597f202---zovivogupikida.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/zusuve.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/23719027509.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/03547a8a0f76bc447768d137fa539f29/31197174191.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/fobikosidolajup.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde2b2d74e---13358348106.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/99999325216.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/muferikajebo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/07573a41946781df8c51355f38aa1e7d/fidomomu.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/7925540601.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/3919184037.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/601fc985e38bfd7092a01050c1cb6b81/dexeluratetixutinazadola.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64a473587---49159251566.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/retitabifozajirizirom.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0b6eaa66---jozam.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/32590475263.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d8c8bfa03f96879838b8d3e8875b783d/50804717947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gun+licence+form+nswPDF 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_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10460 bytes
SHA-256: 6f34dbd3a7ad4297d3b8e097d96d306cd7d5fd9cbcd468a0bb744571b51bcc3c
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 17476 bytes
SHA-256: 56acc14c042008c0eaa4b6fb842ccc1cf1ff9d5789f25500fcacda865546a73b
font_02_sfnt_off0001474e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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