Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c0b0bad6307dd1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 07:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5991e9d076089ffeebdb2a9e94965e7f SHA-1: d087b4cf54f7eb8a77698d3e21fc9de1994697a0 SHA-256: 73c0b0bad6307dd1669f9dd3f690941dc9e5183d368d719d4eeca47c53916c36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicating an attempt to deliver a second-stage payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirection to the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/122ac38bc1769117ec6947f25ef5f855/vamijovilojaxujekasofe.pdf In PDF document text
    • http://saltokisport.com/uploads/files/75721169343.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614507557d9af---rowide.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/xujuliginakomefuf.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/5621959732.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/damamamuri.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/78215178123.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/wulomemukof.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/95868365798.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/44483249690.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614591c8b1c23---92169316530.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/gixozigifejetu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161477101bee85---95737582615.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/bidubajunijewuv.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/pukadesanegasuxerelevipi.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/96728532300.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/16054134059.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210925061554.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/gejidubusegifowenuboma.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/83172835987.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/13233690793.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/daxadejomuxexafagabudozed.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/mamivuxalun.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/bitapawi.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/sujumaguwaw.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/89061404201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ce5+protocol+apkPDF 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_off0000b120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB120 10260 bytes
SHA-256: a12dbdead3706ec06a11d754ed9c76c064736624fa58f6cd2da27118d0e31f5f
font_01_sfnt_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 15228 bytes
SHA-256: 9c1effefd379fcb60de0db2d7fdd56b313823947cb782dd77a014fe6bc5b9ab3

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