Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6df041c93e6994b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 19:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bd77430964f57053e471b53ca4ca252e SHA-1: af6f5ca982b26c0456bbfd3b33ec2a4a0ce20bfa SHA-256: c6df041c93e6994b0c0139867a665b81dfb0c958ab37ff2b5642e902baaf26f1
96 Risk Score

Malware Insights

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

The PDF document was identified as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to direct users to potentially harmful external sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://accuratesearch.com/userfiles/file/55963381401.pdf In PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608051f595570---vusadazoxowux.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/jotomagozux.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/6p2fci4a7edde1k90ppu183tnq/tovaduxavulufeliwer.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/gepalubusorel.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/21991856004.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9fecd16c---38529990135.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/40517719009.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/osg5ggi7m0c8oov5vpqt0k8e5m/zimuzuxepivufuwobipurep.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/83558989207.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983d37e1558---jowugos.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a202dfc0233---kiwupobodarigam.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1e7284ot8b4f5joj7mkt381920/taredononisub.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb77a3e783---65920599926.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbeda39736---jofogenevata.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a30ea3999---toxobeselikivazufuvebe.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/98922046378.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/koxujeseme.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccff030dd3---70599712080.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607780969f658---wulafijidemasoza.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/sopifukeralenel.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607507773e91d---sekenixomofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+polar+and+nonpolar+covalent+bondsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 17780 bytes
SHA-256: b75a13c756300fa0842cb623bd4e2c18426ce05b062928f6b129cfa2c95e295b
font_01_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 10904 bytes
SHA-256: 4a652468b73e278a0cde7637cd0dca945516519d5b8c3c33db4fa348e4ad2499
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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