Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3146e602b85453e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 18:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cab076b013153ea0627c4e5e7e124f5 SHA-1: d7b4f11b275456cd44ef201caf1d36b713d3853b SHA-256: e3146e602b85453e904d2f7604536571694709405f60763a0092819412d72882
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://sluganarodu.org/userfiles/files/dufimazujufalosok.pdf In PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609845e74ed33---18228691463.pdfIn PDF document text
    • http://ridendo.cz/files/file/43318453047.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4a1a2fa0d395168aad23c09de78af9ef/wijam.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/takisujedosamavelugifafi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/452b9pp1vq0pbb5n0kc12vjod6/8332582380.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040927ef8c---rowarivemapumogokoseneme.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/14312475075.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/80496668593.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/pawunasakatabarup.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebe092e2f5---zivelowar.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2427c4da---zaxaxoluw.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/7759390899.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/lafutotitososesej.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k1l4ic2nob5gtjsdgcgnv13dfa/55600123880.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/66abb6eb125ece779af2489388ddfde6/20725850903.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/88698488507.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab169311c1b---62098624000.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/siwimujarujelowifenulini.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/suleluk.pdfIn PDF document text
    • http://simonide.org/userfiles/file/40344522008.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/78245383993.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/605801f20cea5cac6c88cad4fb2e9d44/89415889962.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/kuxovaguvinamoxemepuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sosialisasi+budaya+organisasi+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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 16248 bytes
SHA-256: 784cb0a3a414e5c3b643353f3a6d1f0ee9b3699b9bfa49d49935ce8ef3b83e71
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 10872 bytes
SHA-256: 9f404318c6bd9f6ffb5de84456c8cb0d8a312b9db83b34ff182d2913eb3a7fe8
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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