Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e6abb3d95fd52d…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 05:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2d3c2088787038dbfd6f8c6431c76b6c SHA-1: 31662bfde63f659a743891196fd5b03952bf4c05 SHA-256: 57e6abb3d95fd52d5c285dc94cc451d839a586cd7e7105c31ecc8a397bd65dff
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The file appears to be a link farm designed to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/lvphvbh04p6k569b3nh0qmdt86/xumamitobutewuvunesenedu.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7d9075620611c15e48245b17ed5c5b20/77539392315.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/metorobudegamuse.pdfIn PDF document text
    • https://raljob.com/userfiles/file/fumiwa.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/46224555462.pdfIn PDF document text
    • http://goref.ru/files/file/dojosebezuzegimejel.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb573a508dd---70040790114.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e3db184fd224f276b2bb0d656b1a5803/2157195610.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/98008319993.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b4caa833b28dc522c2844a63ccfb8b60/zudofofexokorilosiri.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a92774c1d0d---sifevokusedevixerotal.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/25735451977.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/97578962d87090a8b63737642ba1c6a4/20347818072.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609679e49ac61---738090865.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5d35037748de988541ca38c1abbdf3d3/wugowomozune.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/gixokiragufevedevux.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/nanexapojatizisebef.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/nrrbpuvmics5p3gacnrf16eb40/nojimodorikomuterexokibiw.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940fe1ba43d---virafelulumilo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/44395cd7e43bdc10536bf57e44ab5961/67575831214.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m9u20d2sckrpq2uae7mqhvh453/81973758806.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zegematew.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/rufomasonafifiragove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=who+does+selena+gomez+play+in+13+reasons+whyPDF 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_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 11216 bytes
SHA-256: e8eb5462dcb48226cb92f07f0944ce988dfc294e516bbc093b7a5d621d84f806
font_01_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 16956 bytes
SHA-256: 86a1942853985e8e9d730a4891feb958c2301ad1a450ddfa97bcfe5203831337
font_02_sfnt_off00014947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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