Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75192d40182bdf9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 02:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b3c2fe629267c8900d36c61fbaded84 SHA-1: ccf00149f3daa881e719cc5c2fc1bbe102d47825 SHA-256: e75192d40182bdf97cc09f438f1bd2377de9caad367b897e823877cb5b572621
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, indicating an attempt to redirect the user. Heuristics identify it as a link farm on disposable hosting and pointing to compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 http://www.ecvbrass.ch/user/web/file/32114081299.pdf In PDF document text
    • https://basisangka.com/contents/files/jajexotojitalomatemeza.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/87991877968.pdfIn PDF document text
    • https://arerp.kr/data/file///zotitugovukiguxosatojan.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906062116.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/54312466399.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d09ecd6a---94044814478.pdfIn PDF document text
    • https://rjpexport.com/files/34841697233.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/tugavevutakatad.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/45758287604.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613967a44d470---nodimugodomusevum.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/kixijexevejes.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b23ced9e24---62542968476.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2a76fb0b---sibutixotonubimujavonen.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/povuwonokol.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/54581088850.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/32370364831.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/vivixobalegazijage.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/32658932134.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/2885001229.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/25649191503.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/87536467105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+a+vcard+on+a+cell+phonePDF link annotation
    • https://lapdonline.org/file/lonuj.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/25297199295.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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 17992 bytes
SHA-256: 238da18427a81d413172962b42b2a5b101a1d1af25bcc8001e7b74bd00c3043c
font_01_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED3 10668 bytes
SHA-256: 5ff68c302aec25d2c0f734f2b8bd6734223bbe2f6694b813eee4f167f6e5defc