Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b661e158403435a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 23:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eb0a6a6a3305f32872b36e3206bb86f SHA-1: 01a46c994a317454911f20803bcb5a82d85015d6 SHA-256: 3b661e158403435ae659ebb1819f955540c995d0c484a3ea3fe4394e5973ced6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used to direct users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=telecharger+logiciel+pour+convertir+pdf+en+excel+gratuit PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607efad072b28---baragekerog.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/97f79c77922e63a4bd3b83d608694aef/kujemimupawojesidol.pdfIn PDF document text
    • http://asvpp.fr/pdf/90324243889.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511190915.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/70494959101.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4df035470e3bd621b74d0c01183addb8/pafakuzuvefosoxufuz.pdfIn PDF document text
    • https://plasy.com/uploads/file/guferodatebofoja.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46093e5ca0---wepimakido.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/78394372321.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/30242681713.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/12133826155.pdfIn PDF document text
    • https://tonitomov.com/picture/file/58113820915.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c4c9e6aaac8ac98e31ec762b08f35ac0/vubitelomimurojikedasor.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/vodogazapagiserukizi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/61248269710.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vujepedukawu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcb0bb70f---xuzedom.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/52747880471.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/rizebatufomudozux.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5db4d963a---93715594172.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o35g61sadt14us5qssk7rsl8r2/wofulikilo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfdb607ac6---86674956395.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e44371ceea4009cf2c1a2165b6eb4260/lofoxopa.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/94127618669.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/wolavekem.pdfIn PDF document text
    • 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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 19396 bytes
SHA-256: f0835d276ffd42de287e52651df902f157c12732db2bed47e9baf662a939b59c
font_01_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 10964 bytes
SHA-256: f72bb88fabce9192a5ea01c516a75813bcabc1eedf7921b575ecc65b778f53cd
font_02_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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