Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d637ed18c3d381f…

MALICIOUS

PDF

92.4 KB Created: 2021-07-21 12:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7331c9343f33291fd678fa3063b2ced SHA-1: 840e3e59ab615341dafa1058f5c42e149bbdf886 SHA-256: 9d637ed18c3d381f2e63c4ba8708eacfda1a06bedb1aba534c37dfcdafc72e08
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://dacinsara.ro/fckfiles/file/46321688149.pdf In PDF document text
    • http://macautemple.com/userfiles/file/72450776238.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f26e773cbe69ac1e51465c8420b503f1/61698800905.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/nezisugixareviferivipo.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/79292974949.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/28c94ed21495f71d42a9111a33a209d4/zejumituzademadovagofosal.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/petepuwawanilimipi.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/gebobijivubuzenipefo.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/55149330834.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4e5a983750c613d8f77c170e1a8585c2/vakonapemojanepatekani.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51b69ed2e---wewekitamaxajo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/paxex.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/10704414225.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b0e15a3d9fd95fccd74c52c1db171a2f/31799261335.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/j6l35njm1n7u82d4hm0fd6msds/26904029712.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/63727379163.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4d30cecc0---54695387194.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210627_190726.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/fagok.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be86570c660---76724485281.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbf23fa2a---bowidilazipitopovamerok.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/78660620132.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xanogafibopixenadugadezi.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/koxari.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cf73876fe84657f643cf514e490e57d6/pemisu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160780b3c90350---77888376955.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/43284935500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ncert+solutions+for+class+8+science+chapter+11+extra+questionsPDF 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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 11160 bytes
SHA-256: aecd39a17c7cf8a2ba68c138f6b8ec729eab010abab8046eef7ad343bef56862
font_03_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 16892 bytes
SHA-256: 21baa1bb55d91e4a0057af8b117c562b49b96e94ca14dfef1f563632bad2e07c