Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac93577d64322c71…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 16:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a241b1ff77764bdd26757d3f086c10c SHA-1: f11a511c6d1e03d7fa8c1e1bece57b85472fd0b6 SHA-256: ac93577d64322c71af11070122c165577c3996c2fd7db07d5b878c5ce7877543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links pointing to websites hosted on compromised WordPress installations, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful sites.

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 https://crewmak.ru/uplcv?utm_term=generalized+anasarca+causes PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b214dda00c---66869609830.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b04b843415---fejadugusa.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/dezasiw.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/55240418ffaab23b02266e8d0004e984/97006597382.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d8c54b13eff403f6cc4306adc0a2126e/92789379955.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/27529140076.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/dbba30e75a83cd7ce1eb0272cca22670/95624622903.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/23363940133.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hnergo8oocgkditi0v8eeph33k/kibekalabunavetomax.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/09v6loviit6kpvja2l660u4q11/pofikufofilegukowasozul.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6363fce2---46179848019.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c17376cab6c---1090455117.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5157a0a7dc---mubizenobazadasuxorub.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/xekised.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf4cef99f---kukobavikiwazalosufanefu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/52867127527.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823ee15e36---60086772476.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/49006688173.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/fexoxa.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k5ag8pnsne763k4nrj9gt8honi/3437879760.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210619100410.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/bunenebesola.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_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10344 bytes
SHA-256: 6528b5a42c3670377f080f76e24451ac8577ec6f0b86d5213d2131909323483e
font_01_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 17316 bytes
SHA-256: 3747bd67f9b57781c13d0d6d7a31449228c18035f12ef6e30b2efc3bfd81128a
font_02_sfnt_off00013899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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