Malicious PDF — malware analysis report

Static analysis result for SHA-256 de521c10aaca8ded…

MALICIOUS

PDF

93.4 KB Created: 2021-07-01 15:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04d1f88595d5a682f3121d232c409fd5 SHA-1: 333bed0b7b4e488f466e4d6ef4ab15be1f7839af SHA-256: de521c10aaca8ded75ae2ce4da5e41d21a88146efd2ea4e9c381df0c71203994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/eb0urbv5j74ntuug12eqdhjt8u/muxarofipusowovolerurag.pdf
    • http://studiobardinisrl.com/userfiles/files/82228598176.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/nobamutepuzurorafaxazu.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2adaf7a8---63487718855.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2a331ae60---93627922807.pdf
    • https://arredamentigiacobbe.it/file/momar.pdf
    • http://polymer-optix.de/userfiles/file/5741811494.pdf
    • https://susta.vn/userfiles/file/72704901087.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0478c4ea5b57859694acb7edb4b3eee7/78807721917.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2495607ef---wexokirovobesesal.pdf
    • https://alshamiltrading.com/alshamilfiles/file/72056697327.pdf
    • https://flyags.com/editorResources/file///81015387801.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zibulasekumonixonozi.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ufu8q6emvcigin9l4thfanndu5/biparezufako.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/628708dec65c185fb250793d3500a06b/37370420306.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62a3fc0b96---lepujafekab.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8634782faad50b9ab894cc71a465946c/37217224619.pdf
    • http://allnatureint.com/userfiles/file/3603896096.pdf
    • https://pharma-tools.eu/galeria/file/mafumexuwexesesulaz.pdf
    • https://daaeportrett.no/upload/file/55611910683.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4091dd704---ribudutavagozubawajizi.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/7912881912.pdf
    • http://qca.ch/userfiles/file/39345464508.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=amtrak+southwest+chief+on+time+performance
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108b0.bin
46214ad06537545412f24693f23e0d0fae273b071e520032c22fb63df880d239
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10956 bytes
font_01_sfnt_off0001220a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 16792 bytes
font_02_sfnt_off00013a1c.bin
e134d3acd9eafc4837797ffcd1d36e810e48c221650203c8719a4b7adab5714d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1C 17516 bytes