Malicious PDF — malware analysis report

Static analysis result for SHA-256 f750895f6ebe250a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 10:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d58f3a8140c6a2c3ffa64db8b3a03ba SHA-1: 1644b13d00a53af887aea65a29839393b85c5b8e SHA-256: f750895f6ebe250a397b913c8efa1734754c295b2368cfe7247dd469b846a42c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one that appears to be a phishing lure related to 'among us hacked'. The presence of numerous URLs hosted on compromised CMS upload storage and disposable hosting further supports a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=among+us+hacked PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa0774144---xosepozupexidik.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/13163534527.pdfIn PDF document text
    • http://gewald.ru/content/Files/57443574333.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/92007238273.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/wamoxutarezuroxaxudi.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/87322978906.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed060ea959---pumuladefabisuj.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/wefezerageba.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/72129141537.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/narovikatovowozixuvinuni.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/67063673617.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/20156157889.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/21986051068.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/5398803221.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jugalesidogemuve.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/29374588025.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/64539890299.pdfIn PDF document text
    • https://istanajp2.com/contents/files/disiledu.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/totenopujixakobuxa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/80657fb9a2013ef4ba6bd09e279fa502/wirefutumexe.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/jolokogugofulaxerawajaxis.pdfIn PDF document text
    • http://mobiliteit.nu/files/30558308049.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/83440782605.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/7201193753.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/xiferi.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/86254572135.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 17824 bytes
SHA-256: 848aaffd4db18130652b243e6e953329a58b07a7ab855ed20de0027899221181
font_01_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001367a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367A 10652 bytes
SHA-256: 86f606a5f461720bdf790fce1588198546e114799f4dc7b6296986a3622fe0f3