Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5af9f23ac66699…

MALICIOUS

PDF

82.2 KB Created: 2021-07-24 23:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b1c9fc7ef91cdab7a431a071e525cc2 SHA-1: edb777cf8b37af972fb32ad623456e35afbc9589 SHA-256: ee5af9f23ac66699c9594e6f005a5c361b6aad97d888555b392525f317d58a2b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security gateways. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 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.
  • 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://all-stage-meditation.tw/uploads/files/60b7c014d21fc.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30c33380---rufiwalujagiz.pdf
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/70262533961.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/nopesogid.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/mukizoki.pdf
    • http://mikailang.net/userfiles/file/20210629105129_232213700.pdf
    • http://doktor-okonski.pl/uploadimg/file/91229062098.pdf
    • http://hutergroup.de/userfiles/file/21088219449.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/povunudusebirodaxa.pdf
    • https://ambulatorioveterinariosismondi.eu/file/gimapekewelaxejamisufoget.pdf
    • http://lineshare.net/upload/files/20210702222114.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759663b4e05---puzijodinak.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9cbbf2afa86fae89d489615d41952576/tukikada.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c334cd3689ac40ecec446497691e6373/88399986225.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/eec83ad5a8268a582f31443bd39707f2/82330180142.pdf
    • http://simonide.org/userfiles/file/56615693377.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb725e3bf3---tetodesejodurin.pdf
    • http://drjoecarver.com/clients/49355/File/pejizo.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/65b182a9f81f54c319cca313073492be/lasuvitetidomen.pdf
    • http://driver-jazda.pl/upload/file/kizejowovew.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086465f2a3b5---romegejuvetubojibim.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9b513fa0e---losuwegu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=descargar+emulador+neo+geo+completo+para+pc+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1c.bin
886f118f4ff3899bf3fe64dd909fac115770b459bc2bea632461446f02403855
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 18712 bytes
font_01_sfnt_off00010a09.bin
ef18bf54923e17c14e12631a6573a213c79272cbc9479b7e289aaef2f98e2b05
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10960 bytes
font_02_sfnt_off00012341.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 16792 bytes