Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1dcd8b0982ca12…

MALICIOUS

PDF

80.8 KB Created: 2021-07-14 00:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 365ea636dca5de63945c6afe191c0c91 SHA-1: 53b2eec389271323921ac74e4136deb43b5b9733 SHA-256: fc1dcd8b0982ca12e1a2ed692f522d38893ff520b6b82355e3d3cd11aa63bb8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs and the heuristic firings indicate a phishing or redirection attempt, likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789737905c4---84806737354.pdf
    • http://ekopaczka.pl/imgbrama/files/witofasuzebuwolokoxub.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/13187945435.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/geg9lc9a920ntjub4cj7lrhvbl/risoxozip.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/dupajatezoziz.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1454d7bca127e9ee51855aca9c40c155/15417817197.pdf
    • http://firegallery.ru/img/upload/56900738402.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160900c33d2bff---58785024008.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087c35f08a04---17458004741.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/56d017b36eeea1f20d771da245af709f/jakovojumiluz.pdf
    • http://thevenetianmask.com/clients/71561/File/95479384271.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798271f1d7b---43203057857.pdf
    • https://charlesstreetvideo.com/userfiles/file/29031732605.pdf
    • http://konyaozgunmobilya.com/userfiles/file/87797951579.pdf
    • https://poolpoint.be/uploads/file/35945529923.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb39dbf523---kokikobonede.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h6l446mvhf54q3m29f512k2oi3/tawuzefitugura.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ca588d3bca1426d32681cd212fd4c46a/4176006576.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/38fsnqpj79dk9fknr693h32ihc/jukutoxejuvodorawu.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/8578720824.pdf
    • https://zebcom.in/userfiles/file/davowovawarefekebido.pdf
    • http://loaamtran.com/files/usersfiles/files/4852532836.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b97ae167f---83687765878.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840332395cd---32362914134.pdf
    • https://a2designbg.com/userfiles/file/ziwuzatebepebilugaw.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/selaluxi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shakira+there%27s+a+she+wolf+in+the+closet
    • 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_off0000d6f1.bin
241d0a8888a2e781f978599bcfd74471effc1165f9b5ac6ddce3f4ef591bb149
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10720 bytes
font_01_sfnt_off0000ef9d.bin
3ed0f92311b791dfef86f7a33e2ac1ea0917e535b1a978e2c2880ab32a588c2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16968 bytes
font_02_sfnt_off00011b8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes