Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83062d34f3229d4…

MALICIOUS

PDF

102.8 KB Created: 2021-07-02 14:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6a40366c26542b5f6b6f69759ebc3ae8 SHA-1: 97730c6342ffe5d9ac5fcf4dd5f3e7d6816ecdb3 SHA-256: a83062d34f3229d4a9a0c9e9c28dce707434f9fccea61845a3179bdaa1ca29b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these compromised sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e110343b92---letubiti.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/57485deef0460e4aa6c216c69eaf4c1d/jemubikerabeg.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d054bd333d2bc7cc9711da822247605a/81296100733.pdfIn PDF document text
    • http://theultimatemarketingsystem.com/survey/userfiles/files/66797316482.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/73799336651.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/watujirekimanige.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hu6bhhb3jg95le9frrulcdoe4r/vulifoto.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/42894499907.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077b106e08c9---11974479989.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/32133233264.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/mobitedumiwafojememar.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a3bf0042---28244271813.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/99778795577.pdfIn PDF document text
    • https://castel.ro/userfiles/file/peladelezavimusiwelawe.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/ruwosojosi.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/30521941396.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac337f8c2b0---zemevudonejedewizet.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b28de2dcc92---41577524030.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2d89f177---25656508839.pdfIn PDF document text
    • http://brlairport.com/images/file/fututomedogu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160968975a847f---vopuxozubagirokenatu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec887ff5cd5c845b95f593117ac72400/dumixenizoludiw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea7b2169c---pexagaparopilufidir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=isotype+allotype+and+idiotypePDF 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_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001445d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445D 19244 bytes
SHA-256: 1ce9f83b7a418850808aa7cfeac2ff70b32b9fa7178d5d6f9ca2efd4b76f14f0
font_02_sfnt_off00017689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17689 10352 bytes
SHA-256: c7aa2cac702b5af70cb9b16a9dd26a8597374911fe0fe5c463cb95c38dbf6204

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