Malicious PDF — malware analysis report

Static analysis result for SHA-256 887802857f78c7d3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 12:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9290a7772708ff2be324520e98fabb38 SHA-1: 5ddd2593194091567446059b9d6ab24d86ff11c0 SHA-256: 887802857f78c7d38c08e2816af181af534ea7272f1f96739dbcec7329210dad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm to distribute malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=given+movie+anime+full+movie PDF link annotation
    • http://sure2trips.com/bot/ckfinder/uf/files/lejanurolorobofowijeru.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/27841689158.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210910221154483.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/kisufojogebakup.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/wimaxiwovifadagopod.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/wezet.pdfIn PDF document text
    • http://wotfiles.com/ckfinder/userfiles/files/73983496882.pdfIn PDF document text
    • http://dhf-china.com/d/files/78586882771.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/363373ae1dd908ef5e4705f514aa6e13/soxuridamopavetijodi.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/12539205992.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1f7c34f95---7305744163.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480b2c3f84b---26298418982.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/devoligabopav.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/37801469240.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mexalomalozeroxub.pdfIn PDF document text
    • http://4rrecycle.com/files/file/wikikazi.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/nisexoli.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/siguvasatilufofa.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/zijobez.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/wepiko.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sukefoxegat.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/rajedifevituburulavopat.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/miwatiromojudifanedonerip.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/20765804116.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_off0000b6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E6 17940 bytes
SHA-256: a4774013f3c5d8bd7144f4c311d908d1dac162975a3a57b7d4e5fdbd7fdd8d5e
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10212 bytes
SHA-256: 36f5db8113b2950602205d0a1a0ef4dcc40642567e1799001381c62191f6d767

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