Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddb463dc1da5482…

MALICIOUS

PDF

113.6 KB Created: 2021-09-07 00:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2541972b8d832c0917b538311610816 SHA-1: 4d49ef31e7c446505fcf296677019b7677d1487a SHA-256: bddb463dc1da5482f902839398178fb851a1dca3c9ce6cd0888b70228ae2cfdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://munis-roquesalbes.cat/demo/vilalba/imatges/file/murazelizapo.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7909ea6485---28385577986.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/11622643492.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/99742948736.pdfIn PDF document text
    • https://fultoys.com/userfiles/gujakunusuxeromofalivij.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/retixalo.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609e73a7586a8---16224181855.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/8019352338.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/roterasiwikinu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee81d9340f0---86434362361.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161052a780e663---40654663623.pdfIn PDF document text
    • http://rld-carbon.ru/file/68560166127.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/pimadebuzeni.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/4mj8knrvqs3v1gibbi20vve7po/43587588263.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/gavob.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074485d6a3cd---zipusuzamagudirevame.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16112098183bc6---65914920937.pdfIn PDF document text
    • http://northcity.rs/slike/files/80652791601.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/7598853577.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/47776376367.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/44532344165.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/59153704888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ielts+advantage+writing+skills+pdfPDF 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_off00015336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15336 20200 bytes
SHA-256: acb56b1a14f17570f4799a06e2a74bc9c34fe2675165d30038620bea03198520
font_01_sfnt_off000187e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E1 10748 bytes
SHA-256: ca6f1a3113406ae64adbff304afc0e5ba2bdd3bc3ab99d39bc00d96b7ef4019f
font_02_sfnt_off0001a093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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