Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba98b8bd05eda39…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 01:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0712dae4a25e37b1c2af1f5ae4f79dee SHA-1: c8f281d184b74ecc5a3a64fb6e7a89342701caef SHA-256: bba98b8bd05eda398f94db914b6b0cdec849cdbc64c5e08e5ef328f3a37733c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cdhsalumni.com/clients/28864/File/33585472320.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/62951035004.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/34263278887.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/45808781145.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/68368cee4f5f09e5ad06d10e91b60589/937040218.pdfIn PDF document text
    • https://ottopianos.nl/files/powigo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/72990907296.pdfIn PDF document text
    • http://sciattella.net/images/file/97485898605.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/63065751240.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03b0442c2---6633052842.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15171698263.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/af3de3090acc96360aba69cbcb90d910/26906590485.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/36131207179.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/60645749759.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/61663947042.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/guzol.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/20394230162.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff4ab1320---suxuperukonoxogalelunokap.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/62823017452.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/zamanefarevuvevipewole.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/pidowujegiruz.pdfIn PDF document text
    • https://isosklo.cz/uploads/65677862111.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/87181994895.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa2eefd46---deriroguxivomiri.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161027cf8a9958---vorezufagosivigojutobuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=spanish+language+pdf+downloadPDF 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_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 18636 bytes
SHA-256: 42b2a21c718d0b07a3b8038eace3ad237e9fa9480e92bc2f3a51cc721865618c
font_01_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 10840 bytes
SHA-256: 45315fac26a40952e6efe92ea5ed10ca19af3dcb84a654c35cc7af2bdfc847d6
font_02_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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