Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8a15cd6aebf784…

MALICIOUS

PDF

91.6 KB Created: 2021-09-22 09:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b9df9accd24cc8e172104057ce21b05 SHA-1: e26ac6b23ca6510b5b265a8ae3a1afa4afb6d2a0 SHA-256: ea8a15cd6aebf78435eae79a2b4b3c665d921bf3d57a820ccd14af6f25840643
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 multiple link farms pointing to external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://valenciamaids.com/userfiles/files/godak.pdf In PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/44945287476.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/48630388119.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/sezisuranomurololez.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/tetajamiwonaduxilowifape.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/lunefidoruw.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/faser.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/nukoxezametedazobed.pdfIn PDF document text
    • http://vaynhe.com/upload/files/fawewasazef.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/01433a77c03fd1360f874789f879cdc6/10141458389.pdfIn PDF document text
    • https://htchninc.com/d/files/55548240972.pdfIn PDF document text
    • http://zzquansu.cn/d/files/7154946600.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xasafolufitirejamizereb.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/60192204174.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cd42346990afd5110c754c8b3330b924/jilelozepedaxepetatojad.pdfIn PDF document text
    • https://betsin.org/userfiles/files/52338208009.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/vewopiguzimefunakedokeri.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/67313504400.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/36821286970.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/40274169445.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/92787153984.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b044955934---1636952334.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210901_092615.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/43722227763.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/06/file/76314467364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+sideload+firestickPDF 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_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 17656 bytes
SHA-256: 9e28af2679d1764db56d74eeeaf559d318ea84d0dd081e9c15531740247173c6
font_02_sfnt_off00014884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14884 10536 bytes
SHA-256: 94f7c1dcbd68e84ca4f160d5a1b8a49289a7875252a00a3c44d3e6b31d3293ed

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