Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d4eab81efb589f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 14:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2295f9238de2fc1e4c10feb6512c77b SHA-1: 4476b02b2e8b1d797af9a40980d677774ae55611 SHA-256: 12d4eab81efb589f8d025995a3452c7701f9e85dcf0fd608b54b2f9cf66ebbbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm detection rules indicates an attempt to leverage these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=ordenes+mendicantes+en+la+nueva+espa%C3%B1a+pdf PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7479131d---73865079692.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/17502588392.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/gofamunaregizu.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/jivum.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/377b7f57fba7bf9fa1035e7020850ea7/37443281450.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wopesonidosodog.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/76094828400.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/76442754267.pdfIn PDF document text
    • https://mar3ol.com/Files/files/bemip.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/14101440087.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/b5c6da58ee62d787bf3c1a2933b65b5d/supisodil.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/817f3939ac33d130eddba63acd35ae8b/17435820946.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/bixivupisuzepifolozajij.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/1hik131uosb9ct23rrco58d06n/27842777174.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb26723730---21277278020.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/2218384320.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169c05397f---todavas.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/34622226914.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2e062b513697e5d74e2f32562df0f0f3/595349031.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/45b88c4fe7ac1ef8fc8544117775febe/5581287182.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612607207e900---xotot.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/58142112029.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09f070498---kefugibakomedisi.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 11056 bytes
SHA-256: 64b8dbf739a32ca9d4bde625469c13c9782ebf4db0f38a7afd9332e509eacd74
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 19252 bytes
SHA-256: 2997d89e14a9bff313f40df84b82d5b6d3922bbd5977a0f03dbae7a2fca93dc3
font_02_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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