Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cc21b4676bfe42…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 17:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48a9d2f9d53d8aa7030868151caaa4eb SHA-1: 0499762e953feee4d07d3bb15df1d5132181c980 SHA-256: b6cc21b4676bfe42b3cdad0f050e2d0f14bd6f83086cb55ea4cd39c05b8ebc4a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The ML classifier strongly indicates maliciousness, and the presence of external URIs and link farms on disposable hosting further supports this. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=division+word+problems+grade+3+worksheet PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9d4ee9b9---powerimufapo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1b6d018f---buvorodenore.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607074d86ed31---7151243735.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/48577722397.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160843dcfa5e7b---rekibaxikufaxidev.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/pivabovenitelufizokidusi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609085d033b08---gegaturilo.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/65180972125.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/30680332052.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/faxiwisitowimugofomuzulok.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a93092b27d3d6e09a4f4e50d68ae0579/86139747983.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf34609ce77---10398328205.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/995d14bc33cff4152b8f2c1a12040aff/83397575409.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/58804869121.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/nerubepalutab.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a926e0c7815---mudite.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021073012325673499.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/pirunopimevudopi.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/s18j6oh3fil5glh1gil1df971s/wewupiboge.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ptdrpvrvqtpraskc3lpvsnbdji/farerud.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7098970fe9e2ed213585b5929cfa658a/xowelite.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5a5a79c86746fd298ff1575fbfc055f0/73437573926.pdfIn PDF document text
    • 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_off0000c4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EA 11396 bytes
SHA-256: eebc6ef5e6c12e6f223c4a585e7c447c5d36691fb4444c6def87aa746e61bac8
font_01_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 17072 bytes
SHA-256: f8f8378f9ebe3ef4b6d529c92a3cc58d7811babb51b1138c72e7033ddfe7789d
font_02_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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