Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94c841347cd40d4…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 15:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2c978ea7e808bfa5683fa7fa0fd53f2d SHA-1: 016dc4f007db6ce7094e6e2a3360dcfdd0820a3b SHA-256: c94c841347cd40d431c12327f03ae8ed8b97a5ef1997f07b090a706f6ad49c9d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://nomylo.ru/uplcv?utm_term=download+noiseware+for+photoshop PDF link annotation
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/25073143478.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/00adc0ab599ddf43004324edbf63911e/finuk.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mdckb3lte9qrnig686p3p3dkb7/97127844437.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6a2bf9b993ab9e9976458eb9276322c/rodesevabogubukegasiso.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/nrbmf50vt5uon7r4i0kk6dd0h6/80718881800.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/giretafaxitorilujeramotu.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/71495560099.pdfIn PDF document text
    • http://egonseetour.com/FileData/ckfinder/files/20210618_A57D0048FC29C6D1.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a9f72edf3---43799902696.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ogdvh473pfi4quj3sjr3pvl3db/wodomawuxelafebilinive.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/54385cc10a637a02305f93cf411aecb7/82252747259.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/towikamowigopes.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/zopezixuzikav.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/1625268534.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1ff7bec6d---28258427896.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/69239638980.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/53223586874.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2aad81b04---11146426557.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/givadanezoxabusomosaveri.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/h9sgjmp97c5ra8co9egshj6puq/84828869054.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a406423938b---kapazetesim.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/47569ccafbeb46a025bf676ffb3b406d/nasivanofavoxuvimopitufuw.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/7d5f2e66e2c76338a55d5f56d1370cf2/zoxusovewufozewida.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/28o6c13ccp6m3vndjrmdlj7m5b/nolomixajodozu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/05fd3b7c82e793921b7a7b7c886ea022/kibawupafebujozulu.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_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10680 bytes
SHA-256: c0e4072eaf803a23dadf919461dfc6ce69f13def668c523305b8fa4b35f4d626
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 17404 bytes
SHA-256: 4200ed0582478a8aa20c4a7191290cac4ac3b5413405311615099b4736090d33
font_02_sfnt_off00014085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1