Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70895c2ea34926b…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 17:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ae2c3e94743650d205cc2651720efbed SHA-1: 6cf40527cf36cd79212624399542f80bd81d8497 SHA-256: f70895c2ea34926b0423acce71cc944de64b65a342d345a33eb3426b25936c61
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 exploiting PDF vulnerabilities or delivering malicious content. Numerous external URLs were extracted, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=unlimited+money+and+gold+kick+the+buddy PDF link annotation
    • https://luckysurface.itweald.com/uploads/files/6130d3234d80b.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/sodarux.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/60099566332.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wunikatarazezalogisudus.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/nenenujedibomox.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/69972403952.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615900a887864---legenasa.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/xawekivokiridub.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/88a2ba540881a81b673cb5558ad55ea4/xiwokurawevojonitakavakig.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/ziwunamosobe.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/jafuxoxenisis.pdfIn PDF document text
    • https://pepsima.biz/files/file/74222569526.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/91078402049.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/66062042917.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/diguxiz.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/suwumegajisemefaja.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/96e5c3987032f8241f84e84cdc875ab3/volugavitifaz.pdfIn PDF document text
    • http://magischtheater.nl/userfiles/file/34828914149.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16156fd37b7913---64258351678.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tj39aucojl6np5cnulbvqkgv5i/64742717007.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/sugofazanefujekem.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/17166635613.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5aceab8bf---kuberezazoju.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9768a528a---worawizitorijitogopotom.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_off0000b4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C1 11000 bytes
SHA-256: a880b82f3a48cb1f53b63d70cb1b21de8bbf6590cd9c2187a02a699744244798
font_01_sfnt_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 15632 bytes
SHA-256: 2123fe77050047194f398704d947c14c4370e26f1a6f8a17f293e419803e2cbb

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