Malicious PDF — malware analysis report

Static analysis result for SHA-256 330183b8fb945678…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 21:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8deb67bd1e675dd5073bc5ddd05580d SHA-1: b23be6d38936f2d641943efaef1ea54db5fcfa60 SHA-256: 330183b8fb9456786b0a1f41116ed4e111016122bd87d841791830a96ef01acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The presence of a URL with a 'utm_term' parameter suggests a phishing or advertising lure. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pixomot.ru/uplcv?utm_term=lark+player+pro+apk PDF link annotation
    • http://jshanwoo.com/ckfinder/userfiles/files/86283755851.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/72954719032.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/nowaxagokisiz.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/jezebigulisis.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f741ce31f6---90978193595.pdfIn PDF document text
    • http://fnathservices.com/upload/file/39976615657.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/80332992162.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/66876052693.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a9efc38fc4c5c77091e36d45f176b108/51219160687.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/kaxafifitokifot.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa25a12ab---niforaxumuvusinilu.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/vidifimatu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135752738452---94046531063.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/wofosadozukirumapu.pdfIn PDF document text
    • http://sartor.ru/upload/files/96405025834.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/3475470027.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/fuvatidutafurovipiger.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/susujumasijure.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/jagivutowosejuzesopefalo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405b295dae4---wijakukube.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/82292090335.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/fakedesimu.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/66682145560.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/21066281716.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/nakamefawokejakifomup.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/16276064943.pdfIn PDF document text
    • https://senegal4d.com/contents/files/93127701545.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_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 9944 bytes
SHA-256: 402523e58004b5a2c517769da9fe20b7841f64eee573d8c443f12e1b7f05d1fe
font_01_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 18648 bytes
SHA-256: d04ebf8d9b133ecd7f4e882f3f965e557d4f2f0c4266414fcdaab7b40900b06d

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