Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5810c7f1d500ede…

MALICIOUS

PDF

91.7 KB Created: 2021-08-03 03:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cff394e25fb0396fa019f3a9e8155974 SHA-1: 7c612f1c8a7c1d16c7abea7e9e0689d029de2de2 SHA-256: f5810c7f1d500edef968b1726ef51ab36ac8b7525879769fc727223a064cc7d0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs, many pointing to compromised CMS upload directories. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions for accessing a password-protected archive, a common tactic to bypass gateway scanning and deliver malware. While no scripts were directly extracted, the PDF structure and URL patterns suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d8716e953---javom.pdf In PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/zaseruwofofapuwodegikatop.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730e27e3404---98919757531.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/83416183222.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81e4e9a88---logaxuporenepepevamuko.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fa25e05295352bc1917371281a0e0303/matedu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cffa685d8ee---migub.pdfIn PDF document text
    • http://djpress.pl/Image/files/4139979710.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68181900f8---xumiru.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/78667538278.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0kvr8tgrvmnlnu4l3a8mqb2goq/8451572083.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/k2a6omd7leqghiq44sv6t0jfoc/tebiwoxofupinisetutofego.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/japuxeledokafuxaveka.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed9bd6329---14027329138.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/50736795038.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/sepalu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/3513184957.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u2p9jdn5ujdgrfnvh4tff6uag5/mevugibanun.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/90215704428.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869197053c4---muxexazidinipixerokexot.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/09da45d2a4fba003df1aefdd41133a5f/forofitexapidojizidinel.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977f973d57---mifazusozoto.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074109bb0577---69340376846.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/bawitigefuvuboginoli.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429103059316019.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/55385912314.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c979ffadce778d0ab67d7cb73634ea6f/walufibojapanapofofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=como+descobrir+a+senha+do+wifi+do+vizinho+pelo+celular+2019PDF 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_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 19268 bytes
SHA-256: a78f05758c68f5c4e0b1b4732886077e18d7934d6c590d9ccc74ddf1047ae7dd
font_01_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 11732 bytes
SHA-256: ce1743b41e13e59c943f49f57c80664efb79252754745f5e6fcce001cab3f265

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