Malicious PDF — malware analysis report

Static analysis result for SHA-256 5246e8f936708c2b…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 05:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 552340b93d6b8dfd76a06810227946bd SHA-1: c4bfeba5289a3180bad8553e9eea6845e2a74fea SHA-256: 5246e8f936708c2b5fa6e2d7af6ee198175b213d721ae29d4ae18cd12ec4cbc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be directing users to potentially malicious or phishing content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://cartopack.com/Images/file/7639989633.pdf In PDF document text
    • http://jarosi.hu/files/file/razasogamopufedowe.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff525ccd6---debumax.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/salonowuxitijifovun.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/52ks9ivr28n1ikpdfklm8hdnb4/53253108072.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/8323754980.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6a1402cd9---95666829975.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/bajupotowip.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2p257d2eonheprqrsrshcamq4/27344782935.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded3cb94eb0---43179952554.pdfIn PDF document text
    • https://csn-alliance.com/data/files/vixugelijakiti.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/25973702466.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/48803188474.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9tboqic452vlc1rmhbospilre2/24972017839.pdfIn PDF document text
    • https://samtee.com/admin/images/file/nuvofovuma.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fodijeboraz.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/desedaxutamoberivoride.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/efc9c20cdf2146c3c6d19f0502ff9a8f/nuwadalokizazul.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210522074826_gzdtjo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/61ca0ff0e6f9b227a1c5bd96af83bf5c/34647021127.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/j8bokv4lv9n5j31ddnpi3r5mol/66146530260.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f7a3cafb---xekenuxipi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bdf4841a9aa1a97485f8117d212aea1f/48963449087.pdfIn PDF document text
    • https://penal-garazh.ru/files/93701355307.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/laxunifaje.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8d5394650dbfa5235fbfecdd7931a146/rekemiwime.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4df47d8d16---36229974225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=devils+demons+and+witchcraft+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 17804 bytes
SHA-256: 9d7c4b16ac8cfc45a275c06b8c6da5779eb31b83bd859b89b41e46d9661c66d2
font_02_sfnt_off00014096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14096 11040 bytes
SHA-256: 5345a478f256db361fab333c0c969d91acb9a5f4dd920b565ea8467a825dad9a

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