Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3d24862938b03f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 09:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 711d4d12c25b972d14c657ac13403dbd SHA-1: deb241a1470745028fb97f7533f28cfbb70bb052 SHA-256: 6e3d24862938b03f3527c0478768fd1b3be8614ccc431c4690dfb5b8ee7b0330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to download further payloads or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://clubforeducation.com/FCKeditor/userfiles/file/gubap.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089775eeb6a0---tetilogufufebexifijutob.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/5753889874.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/pugulozaradi.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/kq1hjoo82etkdjv0vlba4l8a93/27294096126.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210823_224419.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e15eef69c44c97639bfd52c23cca8a9e/44338832163.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/cch9k637616foemcm356e2k01c/92253557378.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/70536309041.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/mevixelunarozesugu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f50df851bea---12186273280.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/58701469280.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20d07d6e5---mimujilasamijelubesubejaf.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2878fc4e---gukibalufawumufapaxeme.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e613088251---89967356801.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce1b85437---27710079271.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/27555637299.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8354670f508a8c225685e1da5c3d0a5e/xasamezan.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9528cf693---83972202587.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bugisobeguximipom.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/fuzobasabunorinebewux.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/b11evj0nlqiibug95515u8alhe/740841482.pdfIn PDF document text
    • http://cartopack.com/Images/file/kekijetogux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=birth+certificate+correction+form+delhi+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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 10768 bytes
SHA-256: d179e4ea979eeddfb832f61fc4622bf74a95c93caa6e2f9ca54dfd807f9cd4ea
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 16968 bytes
SHA-256: 824a545b868c8847180b1756818f7844d0752426fbe9ba72caa3f5bdeea83bec

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