Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccd4b260061a3c3…

MALICIOUS

PDF

74.7 KB Created: 2021-07-09 06:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 418814e573d18d125d9ede18c2068882 SHA-1: 6b01802ef6cd3cb848501e20bb8c3da38088698c SHA-256: 7ccd4b260061a3c375485e6593130cca60054be4dee4aa4fd53d0078db894511
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate that the document is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further suggests an attempt to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=indus+river+start+and+end PDF link annotation
    • http://1hozain.ru/files/userfiles/files/sonaporabozoderotegule.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9dd27e2c3---tuxunap.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a2ae5dc7---35416475068.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/50238618011.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa59ea052d---zezox.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704ebbf3d2c---26153039731.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/5ufc22regn9u1i05g2ti81i14n/16825442106.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe76802ccd---zevabu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nju1pgd0popbo7hnul705bpak6/19627468461.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7841c6ab---14015656017.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/tuwebotikozevokagaxiv.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4552b90a02---xudoxijeluwetujimilufeno.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/9572814286.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/navepemizivapefizin.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4e62d484122760418905217a1e22dad8/gidulalat.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xoguvudameludekesuri.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2154c9879e82e3211463f0d0c472be9a/fabubeketuxibena.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1f6d05f0c1a935b748291c66aaca488d/17951985067.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4c484612---lebibawivurojugu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5aed8d584---kefefewigibi.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/bowolimomuwopurijovagojo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7d33d0d37556cb8ad78b30d2baac2d77/3889316742.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_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 16728 bytes
SHA-256: 917940e2cccc62221f0b8cf9786c367357619cfec964a81393a1da454d1bd4c6
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 10192 bytes
SHA-256: ed408055930868eb9860f44652581d966ccd5d6e8d07f2312ff9dff7980a58d7

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