Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4366db5c32b8763…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 23:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59704fa798f3bd362cecafbb41324729 SHA-1: cd438f116c6ec10d702a2c93f918b512575f8bcd SHA-256: c4366db5c32b87635555384cc8b1517799a126931640475fca8e5200df4aa6f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ecohort.info/userfiles/files/10900805941.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1ddbbc34---3422611652.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/duwisena.pdfIn PDF document text
    • http://uteambio.com/upload/files/60705343750.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/99544502165.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210911134504.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/40984092876.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/jaxojulipalomazaravinun.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gexowasiwivirofavutaje.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/38071682637.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/64817454217.pdfIn PDF document text
    • http://vladekoservis.ru/files/14217198126.pdfIn PDF document text
    • http://sql110.com/pic/49507911206.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/xogarimusiwefuriz.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/43825622419.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/3860144075.pdfIn PDF document text
    • http://megalaserasia.com/upload///gomebivasatisopagipitix.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/82638706341.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bawopudixig.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135518d1aee5---xiriwisonukakinasikejuse.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09934934d---nobixasarodelipepad.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210904173041.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/81883733526.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/ruforokomegenutuziliweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+ball+z+kai+season+1+episode+19PDF 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10980 bytes
SHA-256: 683c79ac6748181abdf26a5688dd788916649f0e6081cd1bcbb6322bf52e4f81
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 17588 bytes
SHA-256: 66dd735a62445cca8d71ed187b23f7335b83b2520966daf05659fefccc287d7e

Open this report in the interactive analyzer, or submit your own file for analysis.