Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e046649a3c325dd…

MALICIOUS

PDF

93.2 KB Created: 2021-09-17 07:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c58242496208ce813d9be8c0d86cc52 SHA-1: c2ad3f83149996815cc024b58a9b16fbc925a464 SHA-256: 7e046649a3c325dd5c4c667b87f6c4025bb61a02d0a6481f481d949a8376f431
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of a link farm pointing to compromised WordPress upload storage suggest an attempt to redirect users to malicious sites. The primary attack pattern involves leveraging a link farm hosted on compromised infrastructure to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd52186c8---56392116020.pdf In PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210909141017.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140224b5a0ab---81631945172.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/mituketidoj.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910105215.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zabigedufoliba.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/jubiboxepebitemuf.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210907095729_1983782584.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/rixuzukajamidawalarilu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/golilazinasolulabik.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/54820440763.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/98094179371.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/murobeposixudekar.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/99892090064.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/39681446161.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c77a7b411---sexaranupalivege.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/1362004840.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/nefuliwiwisizetas.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/59082471460.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/17398113901.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/lofonodasitebuj.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/33891739405.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/2467186154.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210901231010.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/78831403643.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/60895781386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=why+does+my+phone+screen+keep+turning+onPDF 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_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 11052 bytes
SHA-256: b9fb68ee04179d5fdb3d752e07ad7575107c910fe5d53361a72967bc470de747
font_01_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 17848 bytes
SHA-256: 86aab9f645914c32e45ae1cad1a30d9680b1c38b87f373c477d10cecbbb2a528
font_02_sfnt_off00014e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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