Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f48fe811324d5f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 04:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd2ca369ed963410281aca080eb5ab94 SHA-1: 23a68c651e5102ed46ad4be6af0203c07bd3d035 SHA-256: f0f48fe811324d5f7f05f3ed982e613aac700a772439c83b1330ad39b1dc3f48
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. This pattern is indicative of a link farm designed to obscure the ultimate destination of the user, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00c721352---pifuzum.pdf In PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081080147b34---88555805064.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/85417240313.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607763759d469---veludukekojomug.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/xakupuxovikawozobupikomu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/humphimr2b5cbjj2i30ksl0f65/71740113309.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/xomajexi.pdfIn PDF document text
    • http://apcmagon.com/userfiles/webedipasilula.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ejegufetom.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6f9c1c96d0d68a1692f2983c9c1e0994/9994654252.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7d3067ceccea1db31ce26516e77163cc/nidakepokus.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/vupelimolodul.pdfIn PDF document text
    • https://webaprint.be/img/file/nojuje.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/mibagibenafuranewabupi.pdfIn PDF document text
    • http://pronobile.de/catalog/file/lorebenoxejoganiw.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/94481089165.pdfIn PDF document text
    • http://llux.vn/uploads/files/tesawo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/57323738471.pdfIn PDF document text
    • https://phunhai.net/upload/files/badoxeburavoxif.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/46355613769.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/rulixikowodororokepenotux.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/forodunifikiseponilaluvot.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/71950738586.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/ramolunereluvazokej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=plastic+blow+molding+pdfPDF 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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16936 bytes
SHA-256: f76ea2b013b603c9524323684c272197fbbf2c77c0d8e1ff4f49666ee5e07e22
font_01_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10960 bytes
SHA-256: 5b5b6f645da155f11f3ff44aec94985417eb9da779176888cdcfcac9ca3d7679

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