Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5e2f8f01391c68…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 04:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4233270d8ec0c11754f18fc33194abc SHA-1: 9a7c59055d54a288a5ca51a435fc0325b1af8eef SHA-256: 9a5e2f8f01391c68988387d296219adcd2c25705594b000b321ae8bb11699d8d
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 WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or to exploit vulnerabilities. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=what+is+clock+cycle+in+computer+architecture PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6fa2368e11a131b19e8fe486b445fcc4/85791368840.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9562252fec62d0aac17260922a43a2ee/60816966159.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a0fc8e7c1c439429ed9926ebd28186bc/36896060398.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8up34kn86u4j4q1bj19quf69l4/46642023756.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e2046e49d28e6ad6c49d59056b863940/zunamobabuso.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf66b613d24---81389722502.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee9366e12---zefikuv.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/finupasoseweri.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/rixolajewafelisesabafaw.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qil3ctbg7huj1gsg4vdl3gm5f2/rodete.pdfIn PDF document text
    • http://fotossc.pl/_files/file/21453076884.pdfIn PDF document text
    • http://maihome.hu/admin1/file/jabonififezor.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/wodowomuvakewofobodux.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ea02087399d0e3e8bdfceb2e5a534cc5/gafid.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5dcb8b779cee3e78d26d0419fb31653e/70709137690.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb16bcaf5---21768235519.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/debcd6441337803fd9059b009819baf9/75636349405.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/tidupuxananobilusa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3b684e6d---42130162957.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/vefepeloruguwaluv.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798c6fb89e2---puxefik.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae76efbf56e---bapilegawoxu.pdfIn PDF document text
    • 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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 10936 bytes
SHA-256: 0cab71ecf463dba48dd2f56ef048bce4b7e80dd3584bab0e477cc4228e351b7a
font_01_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16964 bytes
SHA-256: 939b0945b8a474ff0bdaefe7dcf4df85a3c7f01de4633df1118e0cb337352984

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