Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c455c4b5eb1a70c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 11:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef7bd55ad1fd86d076709d7394754991 SHA-1: b9399f9e5305603af62f58494f3d25d7c4e4397d SHA-256: 9c455c4b5eb1a70c5d50f9947269ad17b1d973dc1b6b74713b1e13662c62661b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing trojan by ClamAV. It also functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

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 http://kirsanov-maslo.ru/uploads/2060936565.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/bosiduvisezuvo.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/bomiwosazixutedasusav.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/43443201365.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/87034641386.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/tapuravenumunubinex.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/nevozuvufopaxogujujibube.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/51134368846.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/20500430710.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135928f3b9ec---toguvunulusefon.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/94704072745.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/6487777433.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/luzem.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210902_9A194901B924E69A.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/17464607405.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/64457082072.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f83294c23ad83b81b5a100bab0cc8248/dikikoxo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372381cf41d---34877960282.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/wazuriva.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/33256823295.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/371217939.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/tiroforodegowogesotipaboz.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/bepevewul.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109100350358003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=get+all+phrasal+verbsPDF 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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 10276 bytes
SHA-256: 3e02cc2cec5fb6db01322da9a46e99353d680c9ddca4e5102b0d20717838a427
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 19064 bytes
SHA-256: ebc54a437246aba69beaa7979063c742d5af3fb817ebeea1eca3d6170a651e12

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