Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bd4fb025c7b39e…

MALICIOUS

PDF

135.1 KB Created: 2021-07-08 01:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 164ebea3f265906b9faf5efd365bd243 SHA-1: d9c0f531bdf9982ea0d7d32b99051c23bf861345 SHA-256: 26bd4fb025c7b39e1a070214011086f017e161f25054b2c4527ca1407b6d5172
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://secolink.sk/userfiles/file/47084165957.pdf
    • http://studioaba.net/userfiles/files/7431325424.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/95ae8f8fdbff377d2e31766c4f929ebc/73756680905.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097eddf59c39---gexazuwipa.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e9e3fcfd---42542628753.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af098e50a5---bubekuzaxoxiraranado.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/187565221b6b38fdfe87cbf2a44bc7db/rawizedinonaru.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffded0b84e---20128003481.pdf
    • http://akvatoria.by/UserFiles/files/2621161095.pdf
    • https://readandenjoy.ae/userfiles/files/47433547508.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071695e868ee---puwudobugus.pdf
    • https://bleikss.com/userfiles/file/13683308400.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e2ee06ad04d1883ebc6adc6f1615cb31/nuwilusaduporipulewakavo.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/12d386c6e831c5e156473f16bbfaa236/22786041681.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607650ccba7b2---pezarukojufedid.pdf
    • https://ph2020.org/FCKeditor/file/23878596598.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fc7c40cb7bcc973fffccc7e2e12ee9a1/mukimevekilokotirovexe.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4681d476---82909718431.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99ae525b4---96730732521.pdf
    • http://gps-tw.com/CKEdit/upload/files/jusirezoxozamusubew.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/q6a1cgk3luudstvlhv1spj2vnh/pewasifuradomogefopon.pdf
    • https://golf-tout-terrain.com/publish/page/file/87949397792.pdf
    • http://4seasonstours.in/userfiles/file/1597446623.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb032d0cf---vonawoxovajalaxutonomovop.pdf
    • http://matsonconstruction.net/userfiles/file/zotuf.pdf
    • https://hospvetcentral.pt/site/upload/file/kutarejip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=8051+boolean+processor+provides+direct+support+for
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aa43.bin
9065f97a83de5afd830575da86c4f1211e19f6b16f12202eabbe4d73aa592387
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA43 18368 bytes
font_01_sfnt_off0001db5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB5B 16792 bytes
font_02_sfnt_off0001f372.bin
8a7afd6e037a1ceb7968bb17b12c2d9e11c5b9956e9ad26c0ee800d0c1f555af
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F372 11340 bytes