Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fc1ff30a5d4b36…

MALICIOUS

PDF

78.4 KB Created: 2021-07-05 19:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa8493fa7d81b69d1c1bc7d2e92fa54e SHA-1: 5cb63b971412721e75e14fbd5d96bada3c158c64 SHA-256: e3fc1ff30a5d4b36e6b23a981ff9cb24f41f70be960380ec9d9e9062cae6d2ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://crysiq.ru/uplcv?utm_term=keen+to+know+meaning PDF link annotation
    • http://edwardlankin.com/clients/86087/File/doxef.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/livizebuxikugilewuzunumo.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/guwuvozowo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/27379359ab7332631171926778e49b45/47417113216.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/eae497816ebd4f25a87fc0ca45fe37e7/88527941462.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbc114045---44103849567.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f84ee133f---37486989850.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/123bf48899b3076e0d171192e144bb51/77637784104.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/vomifivurop.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/56349364757.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/15012158185.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kibevupixazugutetibune.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b6693d49f120b576c31e03c2fb62238/91075910363.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/87deveitiuod3rrg9an8l22o5v/83706446662.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9ae838faeb3d4853844a67a1a388d359/varoniwaxitin.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b2ede0e1---19445439237.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/72019717668.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe32e2aef8---87253985158.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa907bc929---52854492143.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/92356212336.pdfIn PDF document text
    • http://one9five.com/userfiles/files/20366411433.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fd2ab98c94246525da4a1247a797f9c2/satugomisaxasajabuke.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c3976a96---84770105877.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 10304 bytes
SHA-256: 7d7b24b3d3fec7d75e19655ec973e34ae3a108fa2322c9caa337350fb8e56346
font_01_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 2004 bytes
SHA-256: 45206cabca4c537e7a00881e2e03071933a08580e8a677f4a27e9591c7a53801
font_02_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 18252 bytes
SHA-256: efac66b70fc51ef69afe7470ead4f1ea5d923c955cdc238085edb9cf2119e72a

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