Malicious PDF — malware analysis report

Static analysis result for SHA-256 786b20451695a129…

MALICIOUS

PDF

98.6 KB Created: 2021-07-26 09:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6a2327792a672cc0db71f00d1871fea SHA-1: eb371315b24de0dc77ea7fa8e1f2218a91b306f1 SHA-256: 786b20451695a129d5965af5786f279e780b5767e3805f8938f9df947b13c7ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it's designed as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757cd6d746d---29540184745.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3dd94d26eda839e8babdaa97058c77f2/givededa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/568eb0ienn58a9ivrgi8dfvuv3/rogajividuj.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa18da9c13---bepofeziradujik.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/gezukalibi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd48bd33278---bizodadawutirepo.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/niwevemebuko.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ec982fe4---16998944818.pdfIn PDF document text
    • https://oversaslogistica.it/file/podadogunofanesa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02c12b536---jorunilo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ee0f394e19e5bbd589c0e2df29311f17/kunupajaxe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e42db0718b75493cc3fe290424c25b55/gabufunuvugamezalaw.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ebce8de58---setuvupasafokivasavox.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/xubelap.pdfIn PDF document text
    • https://bataretak.com/img/files/file/9187039945.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sokuwilomavizeregotifujov.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://transport-vehicules.fr/userfiles/file/rinakikodoribakuditubaj.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/87055608025.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/4154448894.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/rusewaluk.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f97ce76b6---fepil.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=world+stamp+price+guidePDF 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_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 10844 bytes
SHA-256: ddd1aa0a9661181468dde880f395e2707d842e42476ad7eefe45efeba4693ba1
font_01_sfnt_off0001355c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 17900 bytes
SHA-256: b6071fbf452b8db817cb2bc5d784b85799e9caa37100659381b7e8b9d996c442

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