Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c4279f08352e90…

MALICIOUS

PDF

93.0 KB Created: 2021-07-05 07:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 644790b201f75edf57cd3504d220f69d SHA-1: ef33c42a587476ee84adcd141cab280518cd8968 SHA-256: 24c4279f08352e901c857b8fd9dd5d800ce8a2cfed2f89a2fdaa8037167d7eda
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to lure users to download potentially malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/28446604438.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2fb68893---40965233581.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160766f6ce0c95---3723147754.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa82c385599---legivexewejeredomo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073a39c0c15d---kuduxon.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/pekifowix.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/54730929739.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1428d9adc---nukodomik.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/89878831736.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/80249558559.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/24b47619e8d76a3a4699ad20b60a0cd3/zudedeguzepopexadoxa.pdfIn PDF document text
    • https://actor-conseil.com/files/file/78059630397.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607488f1952c2---28456293498.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/tonajexazolaxufufusup.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607272cea41f6---tofami.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fdd99fea8551136689aa8b8bdf196f8c/jifefitogarim.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///43886288744.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5k0803v9qtcb5evk26edsr1pqn/galenodekifopuraf.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/37250796650.pdfIn PDF document text
    • http://greece-ex.com/64472985734.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e5d7ccd0---18905364049.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9ee823b96b093df5770cb9384397622f/moxezasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=one+tree+hill+season+1+download+utorrentPDF 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_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 17748 bytes
SHA-256: 06f668ade9e8fcb53966c614cd201d9b58e7c2b713a9dc6a1b3a64db3f106c1f
font_01_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 10608 bytes
SHA-256: 238185938e43c88dbc5a27885b0431bccfa7b62e9a82e23deece6894dd5e0b12
font_02_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
font_03_sfnt_off00014df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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