Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dad833b74e7c28…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 11:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26372ac670c4cc181b93e18d77ac3769 SHA-1: c220e24e7e9357c9d6aadac3ffdf24c8eff6c381 SHA-256: f3dad833b74e7c28345c531a2812580955680c2059c5215bb9a70aae655c6498
204 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a high number of external links, many pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=simple+future+tense+exercises+for+class+3 PDF link annotation
    • http://langeline.com/ckeditor/upload/files/71670474279.pdfIn PDF document text
    • http://philipsphotographystudio.com/75033944600.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/pilinerodewoxizawusunawu.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gitivejukizagijej.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/vimanebewitadapuvenu.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/64862381488.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/tobivuvudoget.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/tibedofaxov.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/82838595745.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qjvh49qau559uhqmgpsl1kukk2/mexovikufofotafotuwijinu.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/12465134586.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/kikeg.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/ximugina.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/datuwev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9a43ccde---xukarizu.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100758525731.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/darikilekojixapibugi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/wovimubimegotidomulug.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ripovevusazofebovatove.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/91511666401.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2826c0c10fe4fadb95114c52b18057a0/29088273983.pdfIn PDF document text
    • http://spharma.ua/files/file/nuwovamepovatilot.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/87898789549.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/95778490538.pdfIn PDF document text
    • 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_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 11088 bytes
SHA-256: d133fe69db9ee0d5ef8851094db1a8fdaf21d6a7953a23dc2c838617be9a6617
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 17652 bytes
SHA-256: 15cac04f313e1aef225b26ada9304cdf466da905ab883e1e07f1489043f8bb34
font_02_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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