Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d0bb44dc71ee1f…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 02:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 430a1c399145a5d250e3ae1ddac8cb88 SHA-1: 0cd1b8f3acd5810111ee90b8445be5cb91aa6350 SHA-256: 03d0bb44dc71ee1f02a9832f45d67bdcd0da58eaa53e8480a5ebc44e6e006c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11ac253a7---wunofonor.pdf. This pattern suggests the document is designed to distribute further malware or conduct phishing attacks, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smidgel.ru/uplcv?utm_term=anthrax+in+cattle+pdf PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/voziwajasotapalowonusu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/kelisojezizes.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607785b3b568e---vagukovuvotewibubewimudu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11ac253a7---wunofonor.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/18630397455.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16094f15ee3cd9---tozefofibofefoneven.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/773788afe9ac20342f797665f1a6c4f6/sisefuloxovazitakarak.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ce5377792---6500827035.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/14347664611.pdfIn PDF document text
    • http://halaljones.com/uploads/files/58878090739.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/88912629620.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/35957846646.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/14208353984.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0427721b1---beloperorodejemet.pdfIn PDF document text
    • https://udruga-invalida.hr/files/21783063577.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/se1mn5vtn0dv7enhi10lo9n8od/jagojikazixapinovexokuwad.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/87077581716.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/81408600174.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/24835428828.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gutukaxirukukunavof.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609afaf897e25---tubabuzunotu.pdfIn PDF document text
    • 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_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 18448 bytes
SHA-256: 2b5ea0ce7f77b1186c497e75401f4f2187b6d52189bd30a83afb55200c2648e9
font_02_sfnt_off00014026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14026 10512 bytes
SHA-256: e94cae431f7f69cbe612c1605792bfe843bedf8f1b34c9e14b88865e16253516

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