Malicious PDF — malware analysis report

Static analysis result for SHA-256 e569c8edaba45229…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 03:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05b611da0b098f5814eb04bf52d47dbc SHA-1: 52b5da37581790c9c8eedf55415383668f97ee9a SHA-256: e569c8edaba452298161394f7f7506c6472198b848a58e0ff925a3a3a000bc1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://linlinline.biz/js/ckfinder/userfiles/files/60589084962.pdf In PDF document text
    • http://slsnn.ru/content/files/kivazewavomugevolerixikis.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/53264529237.pdfIn PDF document text
    • http://ore-processing.ru/d/files/76182086284.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/2528322279.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/41991008101.pdfIn PDF document text
    • https://pellevah.com/upload/files/91186417370.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/44199577119.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/wipukibof.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbb84bc3a---zinibigevujipi.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/doxagizodaxalipud.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/jiwobilibalexad.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/35270560745.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o40fm0bb9tu3i7j3ppnl2eo3p2/50140996251.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wijexenobugijiw.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903093050.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364e0546a17---30038085370.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e91f70cb4b2eb2e948d06fc3724867b6/70742636408.pdfIn PDF document text
    • http://inphilong.com/upload/files/94442639423.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///99603327257.pdfIn PDF document text
    • https://olterus.info/contents/files/gefom.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/jivalabeputulajupoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+style+is+best+for+mePDF 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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 10624 bytes
SHA-256: 850e7630a3c15134af2e4d34924dbcc8c51f53c47ace2dcaf503fb81e8927f77
font_01_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 18136 bytes
SHA-256: 1de71447ab4660c2f222c029e843f0b079e869f1a0b784cdbb9b8d8cf9884492