Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6bb6866b13f388…

MALICIOUS

PDF

95.9 KB Created: 2021-06-30 04:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6472487662fc1e2c52610c9d4665d218 SHA-1: 13cca4d5ccca0a705e6f39a03ea8256839e1919c SHA-256: 4e6bb6866b13f388ac04322cf8b7d18fa092235e0d391ea2c937839f2039a602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://krisoc.ru/uplcv?utm_term=how+to+make+homemade+candle+wick
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/882c34e7b356464b3f305d46078f245e/bejusilupasixuju.pdf
    • https://fruitssupplier.com/app/webroot/img/files/lofojuboruxudowa.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a471f039cee---wuzavivojakine.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/73f14d22145da838774d218f3da53c09/ritavedajanipu.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5ecebee3c5aa6f385d18a8e501d9c1ae/lefojeg.pdf
    • https://diphong.com/uploads/jinotunamovax.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba723011f5e---lototu.pdf
    • http://ccspatti.org/userfiles/file/8365277217.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00cc7a4ee---sefetowetejipuvavobaguse.pdf
    • http://aldara-latinoamerica.com/userfiles/file/putudidojet.pdf
    • https://chp-travel.ir/data/file/24501336886.pdf
    • http://c2r-auto.com/uploadfiles/file/2021063005482573499.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65ba79ea2---duwopesowobol.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodelejojiwi.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/84297215820.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e86e2e9e563ca85dbc2b71decf415009/32063452361.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/27a4be5df17554b5b627495fca8b815f/diluviniwotivugu.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/rfbt2t3eqgfesogk4bt7lo5am6/letugujapezu.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f79dcb7f10e1ee368abd9dfd42060fc7/48334805273.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4606bb88eb---riwikanetapim.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/49c6247e2dcb1b3156237c1db1cab65e/nobujadisakowijotegovig.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gfh6ogj404ek1vivo3hok9fobq/46990775238.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c086d2ad5a3705eb3944836aabdf7202/23904578266.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc2f7b2b2e---77256222624.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/i5f9m69shdvi8ddi3ptkm3ha82/11169577610.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011359.bin
4c015e5adc3cf2f732caec48cb8608116036aef3ea5a1b97476cd4ee356c40dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 17768 bytes
font_01_sfnt_off000140c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C4 16792 bytes
font_02_sfnt_off000158db.bin
055951599294660e41492da6ae9bee2b5e951f04c1f4c95e0092b567904554fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158DB 10536 bytes

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