Malicious PDF — malware analysis report

Static analysis result for SHA-256 c683e948528ceda8…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 19:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ca3ef0082a8cf27717ccf82e2c657ee SHA-1: 2ee7b4ddbdd47f833b6289c7cd1d28706ca1c307 SHA-256: c683e948528ceda89de690fdaa4a2d32dc6b0586818fa9a0cb81567c3722dc89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution lure. The file's structure as a link farm suggests it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd76f2ef579---18573730331.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160caa371a7e97---75732040208.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077037bcea4e---pobigugapetidezadupen.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733a35cc765---6352137803.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/itft5alig23i34dtaldkh96tpb/terovigabiwetusu.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870b57181c6---patiruta.pdf
    • http://ekolojikweb.net/upld/userfiles/file/dujedu.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c53ef0b9d23---16326467744.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09901521a---vigotikibebubidufagepa.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ac431a0f6a8fd51882e08789fe47c8f6/41331158779.pdf
    • http://fogathajtohirek.hu/fckfiles/file/14204674585.pdf
    • http://businessvaluationapp.com//fck_files/file/kitixopawufal.pdf
    • http://1qjd.com/upload/files/2021-07-02-01-11-28-5yz3HLlX.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a4e426f384417824db0a35916b7b4385/87637616354.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/21632450451.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f9821782da2ae4e865f0c7950b7056b6/27141777344.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0up92l8r20ncjko71ijks5me31/51838161074.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j35cvd8k87s2fp0mot94u36jg6/30261110690.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/t6bfdd6qs32btr6lld7gj1l158/nexofamo.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bedf5fb42e7---56057694187.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/da86a1c658635f2a004c6001248f46a4/boloxajeme.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/j0l0rp2qbvami6kj16es3thv7l/sitirurusuxawefukujuza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=html+show+pdf+in+browser
    • 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_off0001021d.bin
85e47ce66f210311154a0144359d75305f127fb1ea03aad785b0ad1f51341c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 17432 bytes
font_01_sfnt_off00012f97.bin
0ada2fa6771b48e91df31b1f9adad307f4e363f4b6c96aa2dbadefc2b8dc0aa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 10820 bytes
font_02_sfnt_off0001481c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1481C 16792 bytes

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