Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cf9e4e8eabb661…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 17:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba4e6f13154c63989e297dfe23950f87 SHA-1: fa04ecc628672cbe37368de8be1233f07454a726 SHA-256: 24cf9e4e8eabb661937c834724ea07a18615227b1dd362517c972522dfef64af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://galerie-louise.be/userfiles/files/32983810014.pdf In PDF document text
    • http://goldendazzle.com/upload/quangtri/files/61397981385.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/vexixerimekamar.pdfIn PDF document text
    • https://doitoutdoorz.com/file/Kecq4O746mYf7H5O.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/rodam.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613582c8b5307---derenan.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/71034222803.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109060800225159.pdfIn PDF document text
    • http://cudicio.it/images/file/19066588169.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/biraresaxekegufotuxe.pdfIn PDF document text
    • http://vhktn.at/images/content/files/60915852139.pdfIn PDF document text
    • http://viorina-deko.com/images/file/divazuwotebodapa.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/dodog.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/25840653990.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/kololibotalufubidexutuxar.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136d60f3bb12---nilewu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/80730617314.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/aenepjck4cci9f340oai2qjtk4/96174850422.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/31288500634.pdfIn PDF document text
    • http://matras-devison.com/upload/file/84998012847.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/67837368697.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/pebeketedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tomb+raider+apk+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 10672 bytes
SHA-256: ad3b9f7358362ceeb94a26a46ad9273885a4b5b7d90e3ca075b988b037ddc0ea
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 19128 bytes
SHA-256: 8d1d78b0d18b1814e29a62206c158c907bba45b2995bc9bb0812049aefff147f
font_03_sfnt_off00013046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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