Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b906cbb91f04d3…

MALICIOUS

PDF

99.7 KB Created: 2021-08-22 02:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 279eb5cc4eeae2a5ff40c3bbc79df53b SHA-1: 9b0fe6ed9771d919a358c99ef6c831514f36e793 SHA-256: 56b906cbb91f04d37ac46d775059719558ea66e716588dfcfe3f27034957277c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that function as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a8d85882783d752fa75dcb4b9e1d9011/7516733152.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oosmnf66feqo2ll57len3309ao/jovaro.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cba16255d37---dazunatujodazexetifex.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88eacacb56---27088740053.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fbc34691caed5b67f37c4b481c4e3891/96105965624.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/lutonugogirewilinuze.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/83365704906.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f226ca10---80697325776.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/dc99925921d6ff7da00ee02523fd1b69/47839239123.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1860aab47---30274440808.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a9467935---meroferijukakonapevave.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tutine.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/44680368887.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/fonimizinufetirexoxemefo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/sibulewilimanojapuponafud.pdfIn PDF document text
    • http://cecev.com/stockages/files/zagologagijub.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f667823f957---saramoburuj.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/13351887989.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/zexivej.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/82056345185.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/gugasa.pdfIn PDF document text
    • http://gekon.net/userfiles/file/mixofanivovekamojivonap.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087217c00589---fefejozemadexoxese.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/sabadadodakakixijuw.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/piridalelopori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apprendre+l%27anglais+en+ligne+gratuitement+d%C3%A9butantPDF 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_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 18528 bytes
SHA-256: 923ef586523e84597329a4f202c09860de928a5cca634a8f8736d670457e429e
font_01_sfnt_off00014c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16497 11024 bytes
SHA-256: faf1711e546b594a6c6425b869239e1f98d59e5cd353078896af8d5a0047d8e5

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