Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1118f6030db0690…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 21:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71639edfab4894499834cbe9934bf9e7 SHA-1: 241abadd10221095f62a517b096f0af88f172812 SHA-256: c1118f6030db0690046a4b9f354f0d2dfce9229484f3ad4e1af2412bf8b32db5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/gojodalumokusebovomemeno.pdf In PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631573310.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132a17d89cc3---motaxawogugonejawujisujel.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/45918888215.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/59b7fa71b2cf372271c180fb28413a3d/duzifelu.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/bogom.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/mezewi.pdfIn PDF document text
    • http://videocycling.info/files/file/83234149355.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/gozunifebomagipokasogov.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/lojukomuloravisapagizes.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/pusukipomutob.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906035506.pdfIn PDF document text
    • http://yejida.com/userfiles/file/73456639898.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/janojomexaxadulena.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/vibeliposujirajesulodolen.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/39396692982.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/47849572255.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/zosedaweg.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/16818343813.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/97549685290.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/banerepituwelokutanugejov.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/85902074422.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/97994778968.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/jomixabaselu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb81a4890e---diwixemixerokekuxafafewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=panic+room+full+movie+onlinePDF 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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 10396 bytes
SHA-256: 24255e3595bb2ca211f57887b65e9ff7b2fbd7de7d11d73ac046a2927e0ade1c
font_02_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 17904 bytes
SHA-256: f2f93005535d60890a37d0cb400f65d0a8daeb881c189628a7244b5008358621