Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47cab378c5b2557…

MALICIOUS

PDF

68.2 KB Created: 2021-09-30 19:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de7ca57bf75888e741b6021cd002b27a SHA-1: d707064ac2b4b3c753a78667a934449f8ca194c3 SHA-256: d47cab378c5b2557b830b2420496a69401deb9c2e76157f36de0969c5cd07e7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://uslugiinzynierskie.eu/eurostyl/photos/file/83371442623.pdf In PDF document text
    • http://crabandclaw.com/uploads/files/videtisopek.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210901133838.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/sakiratexemagu.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/71180459731.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/86132532454.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/14570329003.pdfIn PDF document text
    • http://philboyd.com/wobemesefaf.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c34699c4bac95970cef700405e7322a1/8042617396.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fumulakitosa.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///2935108228.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/48712534955.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/25559324200.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/nanisofasubugotix.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/22349864421.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/jelewe.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/nafigile.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/zolidodemewafawewevaw.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/27526212050.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/56406115330.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f3bc5f3b84787f4b3f57e15fccaf9797/51303144195.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/falozujijanawixunubi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1bd2f135f---fekumunigefalebesef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=stick+fight+the+game+hack+apkPDF link annotation
    • 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_off0000acef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 15228 bytes
SHA-256: de6595dab91d4ff67bb70da64f8d9762c3dc7765cee4f9650a2ff83dc6354adb
font_02_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 10556 bytes
SHA-256: b4d458918824bb6092867406fde62f45cda58ed5e3d7441a42131ad1dd302b67

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