Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdf8f2d981608ef…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 03:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cac5a8c76880ff8c5c01597909ac8c3 SHA-1: cdcc879bdd4d843a4f14cd1570cb56abeeee95c4 SHA-256: acdf8f2d981608ef93f8d0efad86f9d8fef6cefc6faef8b59310489c9437b5c2
196 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised or disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is often password-protected to evade initial security scans. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98337368133.pdf In PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/308872137.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/73382077806.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/35016262940.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/fopikodivifomezafubewosix.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/tawowerosujuzarinibusiza.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/tipapos.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/21488719772.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/10027086283.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/piwawajupidupetogujimug.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/14464261686.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/28294422523.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fb4f79eff23b56b48a5a5c02d219a1aa/povibapoxedi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/92o0kdgf1stolqvcvretkbesti/14435172005.pdfIn PDF document text
    • http://vitrine-prof.com/files/38874927886.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/89983939755.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9561591f---14885398299.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/55638971274.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/fufokijerefonojakuwoxixu.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/rejakexe.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409146c70fa---24937490757.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fevubuwetomapo.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/mumariluvuf.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/48844182220.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614121ed121f1---4039446661.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/71722583387.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/wevuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=edopro+yugioh+androidPDF 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_off0000b990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 10424 bytes
SHA-256: 205c438480f0d94a7ecca636a43e23e991a71903f8e7e6229ad98e0a6ef66151
font_02_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16824 bytes
SHA-256: 6942accc5abede5ec4e4bbb52c3e82bf66c8f8ef25afcdc96c3a49e9994e039e