Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee3a76f24d0aa81…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 01:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1588795189a66cc99839e2fa0dc5e5c4 SHA-1: 68efa216b6e0970b6114175582d6d1ab4ae0118a SHA-256: 8ee3a76f24d0aa81289c0ef10ad6b326627385a6259a074458545693751c2534
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The embedded JavaScript is likely responsible for executing the malicious actions or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161327d007d074---jaletedimitosuzidijekav.pdf In PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kaxepufusokoziluvetonuvaw.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/68629812608.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/37047167344.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/29718278995.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/68777463562.pdfIn PDF document text
    • http://wohingltd.com/userfiles/rimuresukeninolulute.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb428fa48---91671491337.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/89457882732.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/13484982052.pdfIn PDF document text
    • https://pecsikult.hu/files/file/79769227119.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ce08f0b3---mofijazarelozobudulur.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/44539026172.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/henjnrffur4iam1injj7c15c77/75042960848.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/jozibamo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/juzusenebimatexukawowe.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/48592306707.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3674f031a779cff449add52e28ee5bc3/42358094215.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/21065013901.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/boxosivulezijesipifawugif.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6432020d3e4d279f178e2ce73924b38f/zanidaluvalevasubanef.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/61723924071.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/65447770934.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130a616d885c---salufanagudodu.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/52934355989.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e3207671---zugupubevibuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+harry+potter+and+the+half+blood+princePDF 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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 10888 bytes
SHA-256: bb3556ec433c1e777706649cce5a60c88679f950604304854d33c171b7536fec
font_02_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 17832 bytes
SHA-256: a98ae8a507b2392a6d6dfa445c05e40eb1d4284876b50840dda70ca5ae3ba409