Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d234e5917d1926e…

MALICIOUS

PDF

81.5 KB Created: 2021-08-30 12:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7418da1252effa790827c87444fe64a5 SHA-1: 510c83d86cfd3eefd773fc3732e47b4db8e29321 SHA-256: 0d234e5917d1926e5930de3604616027f6aa961c45bab337a96e193c6de9afb9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to numerous PDF files hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of UTM parameters in one URL indicate an effort to obscure the true origin and purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c0ca7fa265e6a69cc19459643060c238/3193669749.pdf In PDF document text
    • https://tempatpasang.com/contents//files/56514620108.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/3460178344.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d822142aa---vuniwe.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c552a254b3b---lodazofivokaxijoriredar.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/nefapikamof.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bc942848acb74ffd2fcae4eff3070343/68605123767.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed69007bc6---66107459750.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/26878248950.pdfIn PDF document text
    • http://greenbrier101.com/userimages/bojazivetavak.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f7ddaf2f---rifotolux.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc85938f5cf---2367377495.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/kizaxofubimos.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4237626bfb3bd756ac476c571c8dc3f7/jukavekemepanurivoki.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f29470422d6---domuduminurobe.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979467dffc---buloputoki.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t4vpfla8aa0tiahmngo268bvkn/25756273852.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/silawazexa.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/fusowiwogara.pdfIn PDF document text
    • http://didopack.com/files/52545088229.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/27286340253.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/67585548728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+extract+xapk+filePDF 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 17676 bytes
SHA-256: ed8959d1ef4c55c1afb079fe9957f698e8833e630848087560604edf255d73e8
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 10472 bytes
SHA-256: d7045598047536adba7c1c34d92c67a4f2ce5970f51e9da7312775ba7e60909f