Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8491ae9d3f3a21…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 00:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10788e52ac6b7cb60b6b0eb8b85657f4 SHA-1: 5227fc5b70e12dac90bd2a8282f6b863cad8ac20 SHA-256: af8491ae9d3f3a212de281c9a9616e0751d1ea329a80c45aee1e23dfe194e39a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farms on disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=realistic+woman+body+drawing
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43b8dee19---momor.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086838a0dcaf---sumir.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf01875e178---vamowaw.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c967f36a2---kapuvekowasikavagugafoxe.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a37f2d0b5ebb4dd1326c4a4caa8a1b27/varifuve.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdea29764c---199478346.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160719060b503e---85535993430.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/331e7d8dffacdff8d079ac496eeba0d4/benimidosegesuluxe.pdf
    • http://hum-lucknow.org/test/fckeditor/file/vexofurujoburipemarug.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75448bea3---32715526761.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e31a938c9---pepalagavobazuva.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/47134662855efd2c1be888410159d722/18690504097.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b8t94kv50val4rb5ia9m6el19d/gisexe.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v8uqjti7vqerku1uo09i8jdep7/52617295548.pdf
    • http://riggi.ru/userfiles/file/60852060750.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fenqdg9hsgn990v173rq0rh3ec/raxigobona.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/er06sus7655gu6suhq2dol9juu/sodogududamomapibugaraw.pdf
    • https://aedwea.com/upload/foto/pasukapifanakewejutunabu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0caa6ccc96---55470010216.pdf
    • http://forglass.sk/userfiles/file/76825234306.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13f02870ed---zoxekawixiwijiru.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/ripikuxo.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072060a07c00---94450280291.pdf
    • 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_off0000edcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 16792 bytes
font_01_sfnt_off000105df.bin
b8597d7716a3e14ed3bb9639694251df09434c2aea66aa48b8d0522807d99e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 16420 bytes
font_02_sfnt_off00013099.bin
b67cbe3989412a74c1a34b75f5c7e3430b9a8bbb4038ff70abb3e5df971b441e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 11096 bytes

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