Malicious PDF — malware analysis report

Static analysis result for SHA-256 9380e7007be7c702…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 05:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 43be5195878fe08ffca00bcdfcee04ec SHA-1: a6f66662abfcd7a4ac653b249b707fa69b97195c SHA-256: 9380e7007be7c70208b25837554b90f3c32698e9279efc9e97efa62433e81119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161563c1375e67---32505709932.pdf In PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/90739132850.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/kebuwoxajutuxexuzu.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/genel.pdfIn PDF document text
    • http://recviem.ru/img/upload/52748658360.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/18840333824.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/40c7f35dea78a6451e602290fa55824a/tanevixujijet.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631805443.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/90286633998.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/todadugijokoz.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/wasibuzulibezikawanolifek.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nutibijiwerilebojozut.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/bcf788ff45a13f965b5130934666cf76/xipupevekilowowefikuwado.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/21410420250.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/8563788888.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/7q2ednqt19eqb3k29efp6lp9it/84782973449.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/wexujabu.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/95343081496.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/jivepu.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/xejizofibiwogepogar.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/55395946325.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/68500121914.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/99504010158.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/16514452076.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f265c8548---46541282809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+meaning+of+depthPDF 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_off0000b51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 10792 bytes
SHA-256: ad352152ec1ed63209539f7602f820a2f4b26aec63f7b72c48cb2239f59ccf40
font_02_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 15088 bytes
SHA-256: c1248a0fcaef6450420fd9ad13e05b80a54733d0ae73e6aeba85fea798d8ddea