Malicious PDF — malware analysis report

Static analysis result for SHA-256 19318e48f763ad9c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 13:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4ec7461d16821dd448ad9816854f537 SHA-1: 7fa2f6dc82c3ceb8fafb49f522c98d7a7cd28224 SHA-256: 19318e48f763ad9ce11f4c16bd8972e60bdd670cb165d43537f6e04642354bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest this document acts as a lure to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16113f5277fb41---27681051580.pdf In PDF document text
    • https://stmarys-perthamboy.com/upload/File/vevananubinagat.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60e78cfa6---fofijurudimifofanikag.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d023fd85e64---58511703541.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/vebosudorubu.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/refuludotitelazikuz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a044c083e8b---pemomobunevasomibukofogi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5472b14b37823b3b74aac4c1fd845fe2/rurolamuzirewufe.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/60288351388.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/77053935989.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea39bb7153---dakade.pdfIn PDF document text
    • http://oris-am.com/editor_up/pajuzomotunivujuguvis.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964123b23cf---sodelokez.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607802688eac8---31568965743.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/fibemewebasoj.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/tolas.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210518044301784.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/51036614911.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/gixipodesulinujonog.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/54f0b1b3e0ece0306d49496fc9a9efd4/72188314524.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/wisisalaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=prayer+for+the+gifts+of+the+holy+spirit+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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 17160 bytes
SHA-256: 2e4446d3a022e3ebb209f82111c050d709f0b447eb8848eb7433b363766fa4a5
font_01_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 10788 bytes
SHA-256: 41446cdc93bd71a9fcc236a73bcee20e8f26db1e512e27787923773f30fa20aa

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