Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cafbcc944acc42…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 05:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36d1ca52e3a1e74ebd98bef0aa23f3ef SHA-1: c006de3bb20bf6c6ea657b10d58becd6dd44203d SHA-256: f1cafbcc944acc421cbe69a98a4afc726c6a464e42f994b1ff2dc62c57d287c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=introduction+computer+notes+pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/jixuvaxetivujora.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca17b44593---48958327739.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/iqf1be6iqsasmopqh92qf20bu1/mapogukefefid.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/56d80439829ca804279fcd02e6471366/tivigetegesubizirubavob.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/u6eebgkggbrfjc1d130jkcmp22/14683073979.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sjd84t79ocko4u9ajh5d025g35/71542103226.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a1ecf3c4ef4cdee4e448f5931921cda6/5576835763.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082b486227---93539028257.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1cda0cbb---gimixomenikixufefabosil.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59332c418---rolome.pdf
    • http://alrehabourhome.com/userfiles/files/96350748487.pdf
    • http://cs-web-design.de/ablage/userfiles/files/soxeferepoleti.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ef424216597f8a6ad77f2c8c5c0fd711/fenitovaronelofede.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/164abddc5e82b9621334d70aaf042301/wizudusinabajuxaxabudutas.pdf
    • http://colorfulmedia.de/fotki/fotki/file/78929788909.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f73fe6d212975fca9b3d73466632b279/kibiwitemugos.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf4b6e17c---31063159815.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/nevcecflpev0f0gljiur64o1se/46789661697.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bade5374a37---modopatibod.pdf
    • https://menlopark.com/wysiwygfiles/file/lojegisufekem.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4209f8a4e946533ba1928a08712328fa/54336015450.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0df8d06d0744713187dbb9b3961f3961/343407546.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hok8lvg1kmt2ihur7k32c7bbp0/lodomekesuxuz.pdf
    • http://omonetach.pl/foto/ilustracje/file/wevaton.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_off0000f368.bin
ea1369678d6de2f89d8a4582dc125f1cffeede0835356ff229c2459feeae3b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10624 bytes
font_01_sfnt_off00010baf.bin
c07366ad59f288652221e0236b7458cde9d7538f3fed6905aacc36609a2a3eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 17048 bytes
font_02_sfnt_off000137f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 16792 bytes

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