Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6767ff2a2a67ad…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 05:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50ff14892d83d458d7175daa445a0818 SHA-1: f16f431922f4c829baeacff2e265c108f4f1582d SHA-256: dd6767ff2a2a67ad50afd6879a5099d063fecea73c369d79d503b986c3ea8bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to direct users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=mechanics+of+materials+6th+edition+beer+solution PDF link annotation
    • https://hearing-outlet.com/uploads/files/202109191737392571.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/midubaxowezabatemuvixero.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432fc81df9d---damapomipikex.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/zinolas.pdfIn PDF document text
    • http://blueparadise.pl/userfiles/file/lilop.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/56094553990.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9feb04f08a6800e6dd90ec24e14cad83/wefuxidolimutipafutujotov.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/42181288088.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/fobadumuzezovizo.pdfIn PDF document text
    • http://bdnchem.com/upload/files/64765873788.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/visovemofano.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/pedufumewozulofubafuv.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/37c357ef9ee3b45da52a911a3a4fd0f8/42033950582.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/5231132519.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141560014f54---77793557822.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/17817178565.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/tapojufo.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/kitadiwos.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/wikefejawunuzax.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc366a67d---sekubenoz.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/tolemizalagasadula.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/xonimiwekadejiwumojunise.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/47338142891.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/molopiginefuvudokime.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210921062111.pdfIn PDF document text
    • 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_off0000b91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91D 18264 bytes
SHA-256: 8fe346abec90cd8bc3f4e61cac92046c4a6120b171c8c7b2c03645bb3722f218
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 11144 bytes
SHA-256: 953cf5a490a0f2055329b9b9101a7371c1825d583cb7253574b279b95ed7c5c8
font_02_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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