Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bf288cc6220092…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 16:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f01a651759f8459828f5a03e04561c47 SHA-1: a9632ef5509559fbd6f0cd8734f9192a8a6702a0 SHA-256: 25bf288cc6220092a907032a7edd4abeb641f34500bbacbf2121f69e382381f1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://krukaiart.com/userfiles/files/89078228088.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/bbe43c742213cd7d9dab72f027fe35bc/deroxeleregodiv.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987498d6535---15569793334.pdf
    • https://avflash.nl/upload/files/wonakomel.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb582a3ad81---14442321374.pdf
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/tipodajazulid.pdf
    • http://wo-kop.pl/userfiles/file/vugok.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bdc80ab478b8c891234c2fa477d6d89d/62130241123.pdf
    • http://vantaibactrungnam.vn/upload/files/makugirov.pdf
    • https://aspaeng.com/files/image/files/jemekepidaluvigel.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5a902fc12---46534821954.pdf
    • http://fautographie.org/images/userfiles/files/lomujabupe.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/metowatojefugonelox.pdf
    • http://photo-preiss.com/upload_files/files/87996390984.pdf
    • https://dcoderesearch.com/uploads/mimotebazudigorunimurav.pdf
    • http://mebelhotel.ru/userfiles/files/nuwotiwijo.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b165ee858---9438822927.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/nuriwunowelagugiwotufi.pdf
    • http://www.motionmantra.com/userfiles/files/vabejafowifudonefukefuf.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/womov.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/63035604949.pdf
    • http://arniestribu.com/campannas/file/wewubokumitazaru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=proposed+new+curriculum+in+kenya+pdf
    • 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_off0000dff8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
font_01_sfnt_off0000f80a.bin
a341bcb280e1dfac5257ca04ee3e087b6c18d54c21dbdfc0b2be23350d3f8477		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 17428 bytes
font_02_sfnt_off0001257c.bin
f88e630a3776681cfc64054693d176b0668f2e3dad3b5c1e6f6b96618ce72d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 11076 bytes

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