Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1cbe43c71b2fb0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 14:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a075947aafd661623eb4436110944bf SHA-1: f51cd65e352b70d38a0c3215f8eee58ca19f5c41 SHA-256: 5a1cbe43c71b2fb00bbf575e610936c4e7e4cff3098254fff84e196dd707c7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs that form a link farm, likely intended to direct users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=red+wine+stain+rug PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/81727e8ad96aeffbc2e244c2098c73f6/6875824821.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/lominimiwiraga.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126e2985e017---14562528317.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/49723849558.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/telozoroluk.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0219bd4e8a801a5df80c7d48e219f707/26167877395.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/89863719420.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca64d967be---68041713282.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/39426385586.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/c7fac48b5c4335e51d8d4e2c048b1699/61342924779.pdfIn PDF document text
    • http://namngonviet.com/user-/files/27561431642.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xemopulaxijub.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9103c642d---wugovepudisiluzawepewabi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59ee4e59f---76168724471.pdfIn PDF document text
    • http://hangquangauto.com/files/tawabixasulik.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/80200238685.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210727_050914.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/93709341592.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sajatalafetin.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/12483109664.pdfIn PDF document text
    • https://khanikango.in/file/dalurepewumuwiwi.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/45668729383.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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 10488 bytes
SHA-256: 2bb4230c18c708d345e6e49f1fd1062abd86d7b13b6b0a520160d3572487dd45
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 17628 bytes
SHA-256: 0ab0f0de0b9e650d29426cfc6ebdd5afd5800cb1039ff810c91bc3493249188e
font_02_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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