Malicious PDF — malware analysis report

Static analysis result for SHA-256 660b522146b8c8c8…

MALICIOUS

PDF

92.9 KB Created: 2021-09-09 13:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da2f5d01de3428368f131d13d506dada SHA-1: 64c863d6b0d74f46062d4de2a14be7d0c1a4f430 SHA-256: 660b522146b8c8c88f20dbaf50f669baf99a9b69c9c6e082fc3cb9f91c3224e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code, possibly to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://tai-group.com/upload/files/vorerabor.pdf In PDF document text
    • https://impactmediaresources.com/userfiles/file/56798980791.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613925f007074---54713009643.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/29440411534.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/sixino.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b044b453551bcb908f703424a9d22e0a/petodix.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/99121855172.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/94888774303.pdfIn PDF document text
    • http://fteq.ru/files/file/82589728755.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/80096600179.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/60858169655.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xupufagixisiwexo.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/70937883057.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971530173550.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/9954408319.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109040454038559788htg6h.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/98048663743.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/44574442493.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6136C94124218.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gogofuw.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132394627597---90764284057.pdfIn PDF document text
    • https://ratosatu.com/contents/files/27991641087.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/liwema.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/69934611425.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/wuvujaxivebuvowude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+beta+apk+1.17PDF 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_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 17932 bytes
SHA-256: ba312a642aafa67fa89dd8e0e4c4a5668c1e1f9fe664cffdd135b3c630721e73
font_02_sfnt_off00014dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDE 10532 bytes
SHA-256: 86cc4c375ab3cac9e211a7d36b183853ac9e360a558d0aa5df4d77adfdc7a590

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