Malicious PDF — malware analysis report

Static analysis result for SHA-256 076aaf94f9a3ec80…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 21:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa7053a31f1c2926ef949eb72ff9b457 SHA-1: e45f0b733495cd74745654261a4d99c5734bcb6a SHA-256: 076aaf94f9a3ec80d413709a0522f4f430f0947c563932c5c154e1afc7b88a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e1751091---84204505442.pdf
    • http://skrabl.pl/www/rpbd/fck/file/72693800655.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a65f1f8a---gunekazotenuzipabu.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6aaadae0a---76186061397.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16095c47f9d041---moxiruvabaxe.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd04d36cd---sesekufefobabo.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fd6afa22bf1b317f5246f96bca1ad866/50632427687.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8n38up4jf2b8gkoce6rfu8i0il/51868000945.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b474874a28c---budozebubejusetilebunodow.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/a305a4e0a0a560d52805b3a7d686aeae/8883799316.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ffa11a5a6---vupupokenagitu.pdf
    • http://yacpa.org/yacpafiles/file/71569373929.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/junifuluzezev.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/594fe8edef88efb6973b9c91f15c4b5a/zixubosixewimogigog.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607710ed1f08a---tuzoroz.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec66babd8---30238858558.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088584d6e78d---raratepedidotisevujema.pdf
    • http://interwork.sk/userfiles/file/domejetor.pdf
    • http://mgocsm.in/userfiles/file/guwamoliketapewa.pdf
    • https://carparts-fixture.com/file/file/fixigifesumupukizekipi.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a972f0e32b---tijamo.pdf
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/99886075037.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c147d113f---32060417061.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089fdfe9f898---wejusuzejeremavuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ovarian+cancer+and+back+pain
    • 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_off0000ed87.bin
f58bec6ca9566c13ff8a99bad3a561de163896775958eb2424c51c4128fdea9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 17164 bytes
font_01_sfnt_off00011a4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 16792 bytes
font_02_sfnt_off00013264.bin
fc383abab2d73736fed23ac1212b9dfc25eb9590c467e45959fc6d769907fde9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 10400 bytes

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