Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90fa685357fc7e4…

MALICIOUS

PDF

113.3 KB Created: 2021-08-08 18:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d2e244b73a9ee35c285e7f84bd1414e SHA-1: b61a177de50d4600759cfd832860d862dca42d07 SHA-256: b90fa685357fc7e491fd0f807487801fe001fef900aab007c780c76fd0fea0d6
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of numerous external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f147a26687---22517472484.pdf In PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/mefakovakovowe.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/05e47494f991032b219084abf0218c69/55428062390.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae9a93a2---motazajosupukawexukezib.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/95059763320.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97c49140c---33894729067.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5tbg0qsc6f88615vp2qmoqahcp/84372678840.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/67263077213.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6b19ca3e---18332092814.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/binilorakojet.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/ziboxitadodegabijidog.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/650ce7f28aeeb3389d770db4a8361a99/mubasof.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/10405086943.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e2406b3b163d4b97e72976f29d87efc7/fisenubawowuju.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc6bd5ae41---noketotuba.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wivazaxixesinevesumito.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b0978c46---dudebikukuge.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/54657095096.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078acc35d9da---74726678587.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7cn60eh2cot8prat6ag56f9o8h/70750716683.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/gepuj.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/8903575072.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/91758035175.pdfIn PDF document text
    • http://timebymtm.com/upload/files/jopifidifosiwedulak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+de+harry+potter+y+la+camara+secreta+cuantas+paginas+tienePDF 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_off00015050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15050 19040 bytes
SHA-256: 82bb759884fdb79df1876c2a33b5de2e6c1c7351817d953cb4c568b61497d853
font_01_sfnt_off000181c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000199dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199DD 11272 bytes
SHA-256: b4fceedca802f8e4911b888c87bafc711c8daa8b53e47962d166bc81a80ed019