Malicious PDF — malware analysis report

Static analysis result for SHA-256 75253aa1bc33f58a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 15:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6a5d959586ab73cb3c1147c4b9ced73 SHA-1: c8dfb8d45d31bf7251ad54a8d9fa35c422863fda SHA-256: 75253aa1bc33f58aad9daca7cc65fd1266237a098fec4bf3c73ba02de1cbcc51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://mollis.rs//files/tofarakawavowaruxevodokup.pdf In PDF document text
    • https://gadd-asso.org/userfiles/file/60749966080.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161206e89be009---913207652.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3329062aaa---64662616326.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/87684887102.pdfIn PDF document text
    • http://chikatere.com/Upload/files/33576301973.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/18609186933.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/57326329095.pdfIn PDF document text
    • https://unosms.us/userfiles/file/wubetutu.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/72301339659.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/pusuzibubodegofiripo.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/5616412279.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16106c9129c004---dadazabelajuxil.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc224df4e---21275056567.pdfIn PDF document text
    • https://camelcarpet.org/d/files/7077948281.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/momejuwadowene.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/zefigelizimup.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16e932f64---sugerusuremonenewaxo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/rovijogamowewos.pdfIn PDF document text
    • http://toonesk.com/upload/29557030710.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/wizix.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/ragozoxuwikodo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2666210677---vefowaxefiwozopere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ayn+rand+the+objectivist+ethics+pdfPDF 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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 18084 bytes
SHA-256: 8dcaf24a7af9607e40e4662ad81946b5055720c339d26bafc4c48725de9e5d88
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 11104 bytes
SHA-256: cf6f24802e36d8dbc0e0df27a107751edad8df5612a39a5b6df382d360891cea

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