Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cfc8f970500662…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 11:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e45ec876ff2b1b5b3e6c733b0fa9c19 SHA-1: 9886a38c174b90bf3afbacf74b335fa6653f0981 SHA-256: 63cfc8f970500662a6df99e5abdeffbfcd6ec7b7dedc4e6d50e4534d8e1b24d0
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=tunneling+techniques+pdf PDF link annotation
    • https://mountmoriahcamp.com/media/30562380577.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e392322be42ace08046d38c407cc9fe0/lukadoxalopuwoluv.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8190a175dd8ed49741e3a3957aa8fcbc/zemijo.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/41423449609.pdfIn PDF document text
    • https://samowar.me/userfiles/files/42114433493.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/nuzetunawikatirawome.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/48864448607.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/rasutavadeset.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/tegoxulikebisopaxuwimu.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/zasepakazabobokonozixira.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/sadojow.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/nanoxibupijegirenidukamin.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/juponepirukeraxiluxiwa.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210527180338.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/dafevuxi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/18722520017.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d80dc037---76608895730.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/77972887004.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/be062ede542b25df02a71dca99061913/suzirifazebabejojoxaka.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/nabesalibanezumugabix.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fisasak.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d32b0d101998fb8880dc728784bf2dd1/17707740987.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/togixofenizumasosupakeki.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73697741378.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_off0000cadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 16780 bytes
SHA-256: b91cdf732fc2d6d7b01f8ad6a6297f480e6397ea28fc24dd9ef1078ad060db85
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10724 bytes
SHA-256: cf242d674cbf49399edeeb10b601c1419e1b0069b51198a69463aa02cc91a172
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1