Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2279e53c154f7a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 10:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5815c4d0425252e2f60cbc59318e7202 SHA-1: 8a75d10041146dfbbdaca6d0d040c39db97681df SHA-256: be2279e53c154f7a2026f1626e5586a97b0a242569e2b9301fbbf6328d654ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rhuyscampingcar.fr/images/files/xosabotanubekeb.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b9fd80a5168dfaa4079e6fa689b72564/vejozefirulezunamiwizu.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/70312510698.pdfIn PDF document text
    • http://ipllaser.in/uploads/61982695530.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f89d8f5e9---xajeg.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/tulejusuwurugutuxabidukex.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/32242411925.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/jebizolulitudegagonifa.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/35906824266.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d34630c7---42062445109.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/kadomatazebirurifobubowe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d53ae18d---wepizolamoboserinovobiv.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/gagavivefijokixoz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a2f1771033f2a27452b5107ecfed2442/walonevisafusiximifisu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6f81febfebbd371bb506531ec1c7f581/94431153651.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d3db591d---zamupopuz.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/wegiluferedazogaguluziru.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/23535671099.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ae7b7553ca7b93bd2a6386522f29b767/janovegivesowalu.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/20879916683.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622436769.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/3178357169.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/16308885298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=crockpot+the+original+slow+cooker+instruction+manualPDF 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_off0000c20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20A 16184 bytes
SHA-256: 5b2aceac5faf8bf72c6515053276c0dd60a147c1851ab6cb519be93735ed99f8
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 11132 bytes
SHA-256: 1e19efa232494c558f14f4a69f54faa93f16902c744714441ed36fac0e61cc5a
font_02_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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