Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e905a9695a9f0f2…

MALICIOUS

PDF

99.8 KB Created: 2021-07-15 17:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 623a9be129a4358e136b7d87d18f6863 SHA-1: 8ccaadd93cb04de01d699a7aba9b8df9e467f996 SHA-256: 3e905a9695a9f0f2c7334c53e0fa60fd022e7f76295eb0ab406a05779f7413ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many of which point to compromised WordPress sites and appear to be part of a link farm designed to obscure malicious destinations. The high-risk heuristic firings and ClamAV detection strongly indicate a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the embedded links suggests potential for JavaScript execution or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://debeleven.net/UserFiles/File/47971073693.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/g9cnhct1850ot500a37pm8c35g/2914506880.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gelavemune.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a9374dd---26526089878.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/698cce87c9c84c21ca28dededfba85a1/41705209643.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rfsqg9599i63v4791i3b8i7jk3/fawiwadiv.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797a6114bd3---81824480776.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/u9f2nf2tj6sh8rdpspf5ft219c/jogadedevifibo.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/392611d1040f7bd1386dccad3a2f56d2/jaxewizifusigu.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/gitapofubexepamureburi.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/17965992107.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/34613993420.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077502030360---15260312386.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210626_96FA66925A9413EC.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160803e5412be4---64959572255.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7tidc2j3g183pq50qmkou4hdf4/wenatekoledikita.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ff308355---82739619129.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c679d0db6ef---77647433039.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/5235820810.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c6bd26e8---kufanofenewiruju.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f56932b6e1e77b721c91f146a8f12847/39263117130.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa9f8ade5---96218787783.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce68283690d---sobodizu.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/napodosul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hogs+back+open+spacePDF 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_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 17816 bytes
SHA-256: f0fcc0272dac7ef537bb8087d779355ce5f006761a2985d079988382d92d9d1e
font_01_sfnt_off00015261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A78 10436 bytes
SHA-256: cfd31b94019a1dc5a4ad5dbefadcbaf9449fc4e3c5f8043875f4dff4be292e51

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