Malicious PDF — malware analysis report

Static analysis result for SHA-256 846e2341eeabe776…

MALICIOUS

PDF

93.7 KB Created: 2021-09-18 07:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 345c0980c4d721b61a085ec429aa66a7 SHA-1: e754a4ae88903fac214136e610ea35dfde9b0d2b SHA-256: 846e2341eeabe776e2c0fac012a4d6a400c05cd733887f7f72e8ca29001e6ae4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious redirects or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://pixomot.ru/uplcv?utm_term=what+is+android+system+android+android PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ffbee85d80c01cd5a1ddf8b0445f03e6/valulezulelijuw.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/dukalalegixaner.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/76262811712.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/33591722498.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11477ed46---nulenewajigutu.pdfIn PDF document text
    • http://esteel.my/userfiles/file/joromajip.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/77369621066.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/91840926954.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/bugebibugoxijawisozanuzex.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/bawaranozupafon.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lerugimo.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/8969283271.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/69357306415.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/kelimifojajevavidakebupu.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/bukufexavefixon.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/givukusegotufugisabu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7a3bbd98---86886481068.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419389233c2---rigijidejowaweguboxujom.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/67794148979.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///kefunilolobililim.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/lunite.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/76b27fa29b64e515e6bb90350439154f/67865514048.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fafamoluvapejor.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/gijatuxuxukemubes.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/govagunumefudafuki.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_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10572 bytes
SHA-256: 6fc1465f8f804f736725e5129f1f0d2358f8a5f94370395ade196eecaa418468
font_01_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 18272 bytes
SHA-256: 5161aff73434bf873c8faae9dfe29e4763ee6613245ec6016604f01ab56cc6c2
font_02_sfnt_off00015075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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