Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ba370c1ee7b2a5…

MALICIOUS

PDF

81.9 KB Created: 2021-07-30 16:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb2361a0c0c91e1bb0d85005139d18cd SHA-1: 3d89db06de086f611f7cdf4b869cf7084fdf749a SHA-256: 44ba370c1ee7b2a58d83c5dc23fca05b5c403938bbb9ab49227d65f3d052aac7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick the user into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mqd0jh7lcog2avptlg5gr8bhqs/vebuxerupuzakapajaveb.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/10573558921.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/vakapudakap.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/94286396534.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d183f5d55f0---novasaga.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/nejelizewutajuwuvuge.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0vvb3hbikma0eagq1v44app48h/gimofumoxapulibodetakixum.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3c010af00---34848195303.pdfIn PDF document text
    • http://debden.org/userfiles/file/89656232203.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/6613199256.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609885473a5b5---92828095545.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5427cac9e---7302008616.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/52621466859.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/wixobesuxeromiwibawopo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ecf676d303366f3ceaf99105859c3ba4/99318383507.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wudegufotilerojesufezibov.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/demimuzanebo.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/pavujoj.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/jariba.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/fupobemuzotebaz.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2766a9b6093f53496ff7583c5386df2e/72366109134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ni%C3%B1o+rico+ni%C3%B1o+listo+pdf+descargarPDF 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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 10980 bytes
SHA-256: 8e1faa5c5e93b48c1e66105e141f28334cc7dc43ab48361af7b815af127f099e
font_01_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 18124 bytes
SHA-256: c4b9aaa2f343d4d74bd897cc8d945ac4f44c84cd284996a7eb0b6b82dec45b8d
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1