Malicious PDF — malware analysis report

Static analysis result for SHA-256 849e615d2974bfc3…

MALICIOUS

PDF

144.9 KB Created: 2021-07-25 11:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d517b9413a4fdcdca4a5ca092a7976e0 SHA-1: a8e0ce0a6e2bfc15ddc37210a5c69d8a245fad85 SHA-256: 849e615d2974bfc3e8b127e597b41d59c71f27d536b2c4ddbc238ae44f9d328e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 7

  • 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.
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a33aeff76---86834010647.pdf In PDF document text
    • http://benetalent.com/upload/files/senodugifuloz.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/vemonitizof.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/87761393707.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/34787880724.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/91913076970.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zisopawumajuvemob.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/5026109976.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a002ccf120---377499359.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/kcvb3vkej83smpisf14mdrue36/taduperixanamatosujufufor.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/80845207240.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090afb84f58d---29145479389.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i1n1vjl01ubq4n63bh1uslqok2/molerugovunivanolutome.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5714bd04---duvirasi.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/jafejokaveviw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/eb554b48157756283b42ec3857c724dc/11810330417.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/sovudilulipufu.pdfIn PDF document text
    • http://metall-press.ru/files/vekev.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fded3366a2b909a429d912593160e710/12181172599.pdfIn PDF document text
    • http://midel.me/userfiles/file/40450499741.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m8ggdepla1od86gusbvrmiscg0/24298664824.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h203p8l5qaif8edqk8n6ef98g7/visepukefisomurijowode.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/64167758572.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160770acd0ed73---35032893699.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pibovugok.pdfIn PDF document text
    • http://cortabellanews.com/userimages/dugerubadupaxoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=guia+para+examen+de+segundo+grado+primer+bimestrePDF 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_off0001d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D304 11072 bytes
SHA-256: 2cf5b8c900e713757046be56e6e6db0ee15300f7ad44b740e5e17efc425706a9
font_01_sfnt_off0001ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC68 18560 bytes
SHA-256: 13209670ec1b6df48da3abfaf8e8f576a0affdc62309034f9cca4af67323fb02
font_02_sfnt_off00021c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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