Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4dccec7607d500…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 00:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6b21bedfb683ce703dc259dc599041a SHA-1: d5b77b888b72c15685802fdc05c58d87e629d5f8 SHA-256: db4dccec7607d500b5b2c9e23269a281e2cf8a205284503dd5d35e1832df2f2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=valores+sociales+y+civicos+2+primaria+pdf PDF link annotation
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160868f6544b05---39797512826.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d959b8b89d6---robara.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/fororo.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/12770586569.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3bbeadaf005caa44684c08e6d1ffe94c/famudokoresokotovejiluv.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kivevovotinati.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb9408dfe---fidebajigolexusax.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/53888421761.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/25699406193.pdfIn PDF document text
    • http://cjatkinson.com/userimages/fiduror.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1285c98b0---16776890134.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jsjlc4vedah6jkk973germtkii/kotafowelunememed.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c7a5095e---befuleponura.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/7vc304q38jn3thtnb761706tv7/85919108.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4085e26559768f52c8103618ff16d73a/7607592432.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/reguw.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c69df5a53cb---86408703900.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/xanusonutigovapus.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q1qrp3vcg5prmu1df97i0mhrms/dokonamasuwumanobaza.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/51372462953.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/51bd6ba6f2c2904d27a05b4236a3bced/12007681003.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/wapele.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/lewunitokiferede.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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 19260 bytes
SHA-256: 3a27d60018edec9311c246b94500ff92e4eecba01c90527b612ffc81d7fb4822
font_02_sfnt_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 10848 bytes
SHA-256: 3dd4260bc7a63a0304c90327bb3e970272bc8b5cd07852d9410de5dbf904f07a

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