Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eaea2674b805830…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 12:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd49058d0c235f3186a36198a8a81eac SHA-1: 1b4eaf9a866a11a1aab5bfc3652afb875bdbfc20 SHA-256: 2eaea2674b805830c3bc0948c04810bedb878f373f9f6d5f2048ee092532aafc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The ML classifier strongly suggests malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://coretry.ru/uplcv?utm_term=2+letter+words+with+v+in+it PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534f0ba54f---bogowikevog.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/zuworafade.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/kesamogapu.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/75795861658.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/nawimelezalogosovobezefo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2789d39406f58aa112f697ec56e8b5d1/sefajaxelejapuxuseg.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/xuwemumeruzoroten.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/56793602859.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd0e012bf---46565899985.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/41977162367.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138de2292700---vebubemimadawufisu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbe81d7bc---wawafitixobanitubata.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/59712500527.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/16599091415.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/wuxizafowutukunoketuki.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/pufujox.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11112776365.pdfIn PDF document text
    • https://webaprint.be/img/file/57091024483.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2b1a9d0b3248a4d8933a3d2682e55ac1/dirozegerepojo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dtm4qt5tklqsd2lf85o76o3482/betolimepuzopoxerezopib.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376639699eb---rofopuwesitise.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/gapogoterulurudati.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/73590894127.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_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 18224 bytes
SHA-256: 1776318b43aa934d51cceb66039842bb6735907e91a257c3009e0329c390680b
font_02_sfnt_off00011956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 10356 bytes
SHA-256: 07c97665e7c4487f885a32c651ebe33182da8f037f038cb70012e8fd9836e4e1

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