Malicious PDF — malware analysis report

Static analysis result for SHA-256 c344744aa8acbc2c…

MALICIOUS

PDF

96.7 KB Created: 2021-07-28 12:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 10088219f10cce134ba3991144eb4fd4 SHA-1: ab3122599dc6bcc2909d285427bfdb39d322f2c2 SHA-256: c344744aa8acbc2c2025c6704467000f023a10764014e042ddd6a5471f90fad4
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://nothingbutsafetyglasses.com/userfiles/file/fodofewularetebuzon.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097508b7942e---fabenedalikede.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rc4e1r36c6biikvgkj1klpdjt8/baxifo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdb6e8ef8---tapegisixunifapilijotix.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/74210840618.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/63c2246d236692f0e6aaaca5afc0e9ad/moguxobe.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/46254947849.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/44903039757.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/16670542440.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210605_D6ED956B9A03EF77.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377d783408---bevikipezexuterufat.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/zokoruvusixabitebilaki.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/19003137093.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/6818763375.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23f5e961f---bikar.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/naxabafebezap.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/6678637003.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e87cddd23---65384916573.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80f0c5f7e---37780654502.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/hav88d132v3crefu3n7sm4anq5/difaxu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12eddae15---nedumomakifemetunujasufo.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/kigazujuju.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/66da589fa3e6ee3f2e33ac6f98af9438/bojubakorobajinagorekud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sony+playstation+5+restock+date+2021PDF link annotation
    • 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_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 18448 bytes
SHA-256: d0dabcac6b0f711414985203091bb916585ccf9a248d9d5997db70887e03bc4b
font_01_sfnt_off00014163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14163 11216 bytes
SHA-256: f7a4dd01513725486d4cc546feb7e74760c743768af70ed20740ccdd8077f1bf
font_02_sfnt_off00015bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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