Malicious PDF — malware analysis report

Static analysis result for SHA-256 751141c3d6730c66…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 00:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e75370381fd27042a3c6ba092c544400 SHA-1: 82ae06b26b22b8f4bc6f6d1cd92368977d6362b8 SHA-256: 751141c3d6730c66ed287e81d4b6b67997e6bd806c15de7495a706a990d932f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=adguard+vpn+pro+mod+apk PDF link annotation
    • http://wsm.hk/images/files/fusiko.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/51005691434.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/makan.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/12289216849.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/dowopafeveduzajupumeboko.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/92003827319.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/detofujebijeluno.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/resudavomadubij.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/wojavoki.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/joxuv.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/19431365980.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/50361668117.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/kusafimafifejuwel.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/bujazijupu.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60594508150.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/82507713875.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/puvowewolugifaxuvod.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/5847766222.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/koxosumorekozasexixu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139296acf049---78595353384.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b66633e57---23908410669.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109041624058250.pdfIn PDF document text
    • http://noble-program.site/js/ckfinder/userfiles/files/korotejibaniwatolarujuva.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vujisexikodukovapige.pdfIn PDF document text
    • http://artepcb.com/upload/files/81268789832.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/55416910209.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4a67da26b15083efb9e6609971d02b22/44172006970.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 17804 bytes
SHA-256: 21bce877a615d6f879431b89f4e01dad5d1fd5468caf4277c63aa03a9682b816
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 10440 bytes
SHA-256: 56ea8862ae153ab83da2dd59c0342b657f3f78989a529fe38fb76be0a48937c7

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