Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3b8c9fb3e1bc0a…

MALICIOUS

PDF

106.8 KB Created: 2021-07-26 07:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c846ad4d924e47bbdaeeecd3ff6b38b SHA-1: ce6a6441d8f6461355669f8bbd3e4dd5f69c8589 SHA-256: 5d3b8c9fb3e1bc0a9d08c763be734bd7241fa6811cee64f755fc8537c0235ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bobl1f73962u911h4ho4hcjlbo/55861447463.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f1efe69f2---31463640288.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/77386115495.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/68785674919.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/21086938219.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d545f2dc4---43048668669.pdfIn PDF document text
    • https://ancoraeducacion.com/images/31302818815.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/40249947569.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/17006098524.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f114edc792d---pileruzozizeruwitafuk.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/34250714049.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/82131325076.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/81b227c6602d29d9dcf115bfe6bfd221/6784774474.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b783259967---4424506901.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/62ikh8d43i5i2ur2tr51e1fvbh/fedijegadomiliroxipu.pdfIn PDF document text
    • http://brlairport.com/images/file/44493502230.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a8ff68e5e337305239cbc09eac015152/20303253271.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160750b99680a6---4818910698.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b141d34ac---sikisemurikoxuzufaxawarof.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099477464163---65773105445.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/gojure.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca8d24bbb---12870820410.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/91715846954.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5de1057c61---wivemeketoduzelezobineji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+meaning+of+dua+qunootPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010c7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C7B 28240 bytes
SHA-256: 08d1a071bcbdda4e5a2451e693a9863bbccdd1990013f3de87ee9fc102297c01
font_01_sfnt_off00013e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8C 17100 bytes
SHA-256: fb9febcc50128fec52f93fa93a00e76f11b30f5c973ccdbd5ed3115cefb2da47
font_02_sfnt_off00016a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000182a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A5 10892 bytes
SHA-256: 4deed905d3597eeefd4a55c5d632a4d9d389210452c9d86c6c986cb76889894b

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