Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a8b6f42a4848fe…

MALICIOUS

PDF

80.7 KB Created: 2021-08-31 06:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7f0cd487c14df7564ad3de0425ff954 SHA-1: 95c9296dff353e4878e77bc7557935827d00cd69 SHA-256: 71a8b6f42a4848fed242bc0b097312efd0ff5bc28eb70c29f7f07692cb5e398e
236 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing and malware distribution lure. It contains numerous links to external PDF files hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, which is a common social engineering tactic to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mexvp.com/ckfinder/userfiles/files/fibokuwukesevowu.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073177059320---fedaliw.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a1d9ba786fdefbb63ced4f54598fd966/wezaxegazevaviboredeju.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/97488875539.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0de3kmifcpae4qvm2r7a5o3j5/99577285865.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/r5eik9pcj93mlos0gt4mgib5m0/lujoraxopitexanom.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/94401733085.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/fabofivatanejitivik.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/xetoxari.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988dfbd87d3---rabewaludeperagevonudo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce831b21757---vaxutasajedovapipikokil.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/3798610749.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210823233442.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/42bf8c6e8c61e85967eeb15788443799/jomupisorizuf.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/tedikafoxixupavitefimifaw.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60c376cb8---wuripegobakasepozimoxog.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/29994570120.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a484e429c9e---pewun.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57251364445.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb91cf2b8---wifiz.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2cda6db24fd1f97cdc6cbbfb36e01791/pumelodefipakamavi.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/76679363160.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/39564237371.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69410a909---64564463680.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/xajumupakijarirogibasem.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/39988089759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+into+image+onlinePDF 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_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 10432 bytes
SHA-256: 5311a7454d797f838f59b2352178cd89527283e47af3af6655809be121bd2edf
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 18200 bytes
SHA-256: 1960459446b5e0f999d4458335ffc2cb8bbbac0671144121a8943e57d1b8656f
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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